It doesn't for someone like me, not really. I don't have enough track record to get special information (which is a good call, I'd blab). If a new console does hit next fall, I imagine the situation would be that the 360 release would go ahead as scheduled, and if it does well I imagine MS would support the porting to the new console.
Since I dev with unity, I can publish to all the major platforms IF I get an agreement with that company. Assuming my sales are decent I'd like to see a porting to WiiU and PS3, but I don't know anyone at either company so I don't have an in there.
-edit-
if anyone is considering going into game dev,
Unity is just as fantastic as everyone says.
Corona is cool for mobile devices, just don't count on anything Ansca says to ever happen.
Torque 3d, I have found memories of from my first dip into becoming a game dev almost 10 years ago, but it's stuck 10 years behind, and windows only.
impactJS is sick, but it's HTML5 so Android support is weak pre 4.0
Those are the indie level engines I have experience developing with. Unreal is bad ass as well, but it's overkill and the royalty isn't acceptable for an indie IMO, unless you manage to rocket.
the romantic dchuk has entertained the idea of diving headfirst into Unity dev to make some games. Just haven't made that jump yet.