One 2008 presidential candidate is expected to formally launch a new bid for the White House this week, while another may be nearing indictment in a probe into whether he illegally used campaign funds to cover up an affair. Here is a look at this and other stories that CNN plans to follow this week:
Romney to become sixth official GOP presidential candidate for 2012
Former Massachusetts Gov. Mitt Romney on Thursday is expected to formally announce his candidacy for president. Romney is to make his announcement in New Hampshire â€“ site of 2012â€™s first presidential primary â€“ and will be the sixth person to formally seek the Republican nomination.
Even with Romneyâ€™s announcement, the field would appear to be far from set. A number of other Republicans are considering White House bids, including former New York City Mayor Rudy Giuliani, who is scheduled to be in New Hampshire on Thursday to headline an event for the state Republican Party.
Former Minnesota Gov. Tim Pawlenty, businessman Herman Cain, former U.S. House Speaker Newt Gingrich, U.S. Rep. Ron Paul of Texas and former New Mexico Gov. Gary Johnson are official candidates for the 2012 Republican presidential nomination.
On Friday, a number of GOP presidential candidates and potential candidates will be in Washington to address the Faith and Freedom Coalition forum, a major gathering of socially conservative activists. Socially conservative voters have an influential role in picking the GOP nominee.
Will John Edwards be indicted?
This week could bring the next step - likely an indictment or a plea deal, according to sources with knowledge of the case - in a federal investigation of former U.S. Sen. John Edwards. A grand jury has been investigating whether he illegally used campaign funds to try to cover up an affair with a video producer working for his 2008 presidential campaign.
Sources have told CNN that the U.S. Justice Department is preparing to indict Edwards unless he and prosecutors reach a plea deal. His defense team says Edwards is innocent and that a prosecution is unwarranted.
Obama to participate in Memorial Day ceremony
U.S. President Barack Obama will be among 5,000 people attending Monday's Memorial Day service at Arlington National Cemetery in Virginia, where service members already have used the weekend to pay respects to fallen troops. Obama also will participate in a wreath-laying ceremony at Arlington'sÂ Tomb of the Unknown Soldier.
As of this Memorial Day, a day used to honor Americans who've died in war, more than 6,000 U.S. and coalition troops have been killed in the current wars in Afghanistan and Iraq. You can read stories of the fallen on CNN's Home and Away interactive feature.
Zuma to meet with Gadhafi about conflict in Libya
South African President Jacob Zuma is expected toÂ meet Libyan leader Moammar Gadhafi on MondayÂ as part of an international effort to end a months-long internal conflict in Libya.
Zuma is a member of an African Union panel aimed at ending the battles between rebels and forces loyal to Gadhafi. An African Union delegation visited Libya to seek a cease-fire last month, butÂ fighting continues.
A coalition of nations under NATO has been striking military targets in Libya as part of a United Nations mandate to protect civilians.
USDA to replace food pyramid
Out with the pyramid and in with the plate.
The U.S. Department of Agriculture on Thursday is expected to unveil a new diagram intended to guide people to make healthy food choices.Â A source familiar with the new guidelines says the USDA will replace its current food pyramid with a plate icon.
Endeavour scheduled to wrap its final mission this week
NASA's space shuttle Endeavour is set to begin its retirement this week following its return from space.
Endeavour's first landing opportunity is Wednesday in Florida, shortly after 2:30 a.m. The shuttle and its crew have been on a mission involving the international space station - including maintenance spacewalks - Â since Endeavour's May 16 liftoff.
NASA is retiring its entire shuttle fleet. Atlantis is scheduled to be the last shuttle in space; its launch is scheduled for July 8.
Will court end NFL lockout?
An appeals court on Friday will hear arguments over whether it should overturn a judge's April decision to lift the NFL's lockout of its players.
U.S. District Judge Susan Richard Nelson's April 25 ruling lifted the lockout, but it resumed days later when the 8th U.S. Circuit Court of Appeals in St. Louis temporarily blocked Nelson's decision. The NFL had appealed Nelson's ruling, arguing that law prohibits such injunctions in labor disputes.
The appeals court now must decide whether to overturn Nelson's decision. If it does, NFL owners will continue to lock out their players while negotiating a new collective bargaining agreement with them - a situation that could delay the start of the 2011-2012 season if a deal isn't done soon.
Owners and players are arguing about, among other things, how to divide the league's $9 billion in annual revenue. Currently, the NFL owners take $1 billion of the top, and players get 60% after that. The owners say that arrangement is outdated because it doesn't take into account the rising costs associated with building stadiums and promoting the game, but players counter that the teams haven't sufficiently opened up their books to prove this.
Time for the spelling bee
More than 270 boys and girls will be reaching for the top guerdon - er, reward - in this week's televised Scripps National Spelling Bee in Washington.
Preliminaries begin Wednesday, and ESPN will show Thursday's semifinals (10 a.m. ET) and finals (8:30 p.m.).
This year's event features two finalists from last year. The winning words for the past three years were guerdon (2008), laodicean (lukewarm; 2009), and stromuhr (an instrument measuring the flow of viscous substances; 2010).
The contest comes more than two months after the first national spelling bee champion, 1925 winner Frank Neuhauser, died at age 97.
- CNN's Paul Steinhauser contributed to this report.