Mirror's Edge 2 (although EA have hinted they're working on it, so... fingers crossed?)
Also, the third game in the Legend of Zelda: Oracles games. In addition to Seasons and Ages, there would have been a third, focusing on changing the time of day. It got cancelled due to the link system of codes. Basically, at the end of an Oracles game, you were given a code to enter into the other game to start a Master Quest style of game. Characters from Seasons would make cameos in Ages (or vice versa), you could get more codes to get extra items, like the Master Sword or Seed Satchel that held 99 seeds rather than 30 or 50, and after defeating the Big Bad of that particular game, you got to fight Twinrova and Ganon. It was pretty damn cool.
Unfortunately, the third game was pulled after Nintendo realised two games meant there were two paths to linked completion (Seasons, then Ages, or Ages, then Seasons), but with three games, there would have been six ways, and the codes would have been too hard and complicated to make work correctly on the Game Boy Color. So, it was cancelled. It's a shame. It also looks incomplete, because the Oracle of Seasons is called Din, and the Oracle of Ages is called Nayru, so presumably the third Oracle would have been Faeroe, and green-haired. It's a shame. A bit of wasted potential, there. I really like those games.