1. A true large scale battle game, kind of like what Hell Let Loose is, but for knights, samurai, spartans, Persian Immortals, and any number of other warriors throughout history. Each has their own skill tree and strategies, you can control troop movements on the battlefield, and become an individual warrior and enter the fray. You can pick a 'campaign mode' which consists of conquering surrounding civilizations, or make the setting a historically significant battlefield like Thermopylae.
2. A spy rpg, where you follow the life of a CIA case officer, or KGB operative. Kind of like what Sam Fisher did with Splinter Cell, but those games missed out on big aspects of spycraft, like developing assets and constructing a spy network for intelligence gathering.
3. A good surfing game. I love surfing and have done it most of my life, but I haven't happened across a video game that does a good job capturing what surfing is like. They either make the surfer impossible to unseat from their board, or make every wave teetering on the edge of wiping out. I know water physics are hard in games but I keep holding my breath a game studio gets it right.