In general, remakes and remasters aren't usually relevant to me because I play on PC 99% of the time, but I really like how the definitive editions of Age of Empires II and III added so many more civilizations and stuff. I'm also eagerly awaiting Age of Mythology: Retold, which will hopefully be better than the last port that added the half-baked Chinese civilization.
That being said, there's also a huge back catalogue of Microsoft Game Studios PC games from the '00s that never got digital releases and are currently abandonware, that I'd really like to see rereleased on modern stores like Steam and GOG. We're still missing Zoo Tycoon 1 and 2 (both among my favorite games as a kid), Freelancer, Rise of Nations: Rise of Legends, Fable 2 and 3, and a whole bunch of racing games that are probably in licensing limbo because of outdated IP laws.