One rumor is that "he's not coming back this season at all." This has little merit or credibility, and there are multiple reasons why it his highly doubtful this occurs.
The basis of this rumor seems to be a combination of some Bulls fans wanting it to be the case and the media overhyping a quote from Derrick Rose.
In an interview with Rachel Nichols of ESPN, Rose said, in regard to his return, "Who knows when that time is? If it's all year I might wait the whole year, so what? If I come back at the All-Star (break), so what?"
The "if it's all year" part has been taken out of context to make it seem that it was actually being presented as a possibility, rather than just a rhetorical tool. Those who don't want him to return were particularly eager to jump on this.
So why would any self-respecting Bulls fan not want Rose to come back?
A segment, albeit a minority segment, of Bulls fans has pushed for the "tank" mentality. Essentially, they argue that the Bulls aren't going to win the title anyway, so why "rush" Rose back. Let him sit out the whole year and then come back next year. They argue that there's less risk if the Bulls wait the entire season.
In the meantime, the Bulls just help their draft position by being a worse team without him.
Apparently, the Bulls aren't cooperating with that strategy, as they currently lead the Central Division and hold the fourth-best record in the East, even without Rose, and lately Richard Hamilton or Kirk Hinrich either.
Rose's return could very much put the Bulls in title contention, and there's every reason in the world he should return this year, particularly when there's not a shred of evidence to suggest that waiting four more months after he's 100 percent makes it any safer for him to return then than now.