After Sonic Boom is up, you might be familiar to this. Another Sonic Game could come by next year named Sonic Runners. We don't know where it'll end up, what consoles will get it (obvious its off the Agreement so its possible it can end up in Last Gen and Next Gen consoles such as the PS4, XB1, along with the PS3 and XB360). IT might include a few things that might come "after" Sonic boom and the others I don't know about which might come later on, anyway. There is a possible chance that by the beginning of next year, presubly January of 2015, there could be more info. I have the link to the article if you need to know.
Again, this is a RUMOR so we don't have any comformation from SEGA about this. Any thoughts about this? Feel free to discuss.