We're learning a bit more about who is – and isn't – going to be in President Barack Obama's second-term cabinet.

U.S. Labor Secretary Hilda Solis (pictured) has submitted her resignation, CNN learned Wednesday. She said in a letter to colleagues that she discussed the matter with her family over the holidays in California has "decided to begin a new future."

U.S. Attorney General Eric Holder, meanwhile, will remain in the cabinet for now, a White House official tells CNN. It's unclear how long Holder will stay into a second term, but the official said he and Health Secretary Kathleen Sebelius and Veterans Affairs Secretary Eric Shinseki are not expected to leave in the near future.

Obama's cabinet: Who's in, who's out?