Okay, the new TV Guide has some interesting Spoilers on this (as well as a great picture of Hugh on the cover).
The only confirmed thing I have heard is that Oma r is not leaving the show. How it all pans out I have not heard.
Now from here on out it is purely specualtion and to my knowledge none of it is reliable or from a confirmed good source so take it all with a huge grain of salt.
From what I have heard, the whole will he leave or won't he is going to be part of the "cliffhanger" of the season (I think this is covered in the TV Guide article but maybe not). So we will not know where Foreman ends up until next season.
I have also heard speculation that Foreman will not leave but will take up another position at the hospital. Will this open the door for a new duckling? Quite possibly. Could it be the nutritionist House has an eye on? Maybe. What position will Foreman have at the hospital? Don't know and have not heard any speculation.
I know, helpful as heck huh?
I really am trying to avoid in depth spoilers this season so have not dug into anyhting too deeply. Most of what I see and read is in my capacity as a mod over at Devoted. As a mod you kind of have to at least scan over everything so I do get exposed to some of this stuff whether I want to or not.
I think a new duckling would be a great change of pace and really highlight the way that the other ducklings have grown in their time with House. Although, they really are accentuating that this season with Chase, which I think is realistic and fun to watch.
Anyhow, it'll be interesting to see where Foreman lands and how that affects everyone's relationship to him. Plus, if Foreman is gone, or at least not a duckling, they may devote more time to explaining Cameron! Please, give us something we can work with!!!