AVault is reporting (by way of a telephone interview) that John Romero has returned to designing single player maps. Up until now, Romero's role was simply as the game's designer, overseeing the production of the game, but not making any levels himself. Here's what John had to say:

“I am now involved in designing single-player maps,” Romero told us in a telephone interview this afternoon. “I get to the office around 10:00 a.m. and stay until 1:00 in the morning most days. Last night, I was here until 4:30 a.m.” Additionally, he is still involved with his supervisory role, something else that no doubt contributes to the long days during the current crunch mode.