If RS remakes were to be released in 2012, then it would be interesting to see when the eventual Gray Version would be released.
I think it would be pretty safe to say at this point that we will not be getting it in 2011. If it were released in 2012, it would be too close to the release of the R/S remakes. (Though this wouldn't be the first time this has happened...FRLG and Emerald were both released in 2004 in Japan.) 2013 also doesn't work too well, mostly because that it would be almost too late for it, especially when there are hints that this generation might be shorter than the last two. By 2014, we will almost certainly be approaching/in the sixth generation, so that's an obvious no.
Based on this, I believe RS remakes may have to wait until the sixth generation, or at least might be held off until 2013. The only routes that they could go with to get RS remakes in 2012 is to either release Gray in Spring 2012, Spring 2013 (unlikely), or skip it all together. (very unlikely) They could also release RS remakes in early 2012 and Gray in late 2012, but again, we come up with the "rushing" issue, as well as the fact that the anniversary date would be quite away off, defeating the purpose of a 2012 release. As such, despite it being seemingly obvious that an RS remake would be released in 2012, (if at all) that would either make Gray either rushed or delayed. It is for this reason that I believe that RS remakes will come in 2013, if it were to come in Generation V.
Another possible route would be for Game Freak to hold off RS remakes until the sixth generation so that they can be released on the 3DS. With this schedule, they could do a 13th anniversary in 2015, right in the middle of Generation VI.