I hate it when people say it is too early for another main game. It has been about a year. Crystal came out about a year after GS. RS 10th aniv is coming next year. Geez just because they announce a main game doesn't mean it comes out the day it's announced, it takes time to make the games. If it is a new main game we won't see it in stores for another 4-5 months. And for people saying it won't be remakes because Grey isn't out yet, look back in 3rd gen FRLG came before Emerald.
Then Platinum came out before Heartgold/Soulsilver, so we don't really have a way of knowing at this point. Even if we do get a spin off, as long as it's good, I wouldn't complain.