I think the exclusive support for Wii motion plus is where they're worried. The games selling point is with a peripheral which was predominantly bought by the 'Wii Sports' crowd and while they could bundle RS2 with the thing, to me it seems a bit late.
The other thing is these companeis normally have a good grasp of how a title will do before launch. They've got preorders, market research from things like internet searches, popularity on press websites etc and other stuff.
This does most likely mean it's marketing budget will be slashed too, but if Ubisoft's data says the game pre-launch isn't popular, then it may make sense not to blow alot of money marketing the game. Depends how it all adds up I guess *Shrug*.