Sega has seemed to have partnered up with Nintendo for the next three Sonic the Hedgehog titles to be Nintendo-exclusives. These games are:
Sonic Lost World
Mario & Sonic at the Sochi Winter Games (In Sochi, Russia)
One unannounced Sonic the Hedgehog title
With this lineup, you can see Sega and Nintendo having great games until 2015!
I just have one issue with this partnership.... WHERE'S MY YOSHI'S STORY REMAKE?! I mean, it's cool they have Sonic games, but I wanna Yoshi game!