Where the hell is Cuphead? That's a question that's been floating around for a couple of years -- and still no answer.
This highly-anticipated game was revealed at E3 2014, a reported four years into its development (It's worth mentioning that the game started life under the development of two brothers, but now the team consists of almost 20 people).
Cuphead is a side-scrolling shooter -- like Megaman on steroids, with the art-style of a 1930's cartoon. The game is beautiful and was originally intended to be entirely made up of boss fights. But based on fan adoration, Microsoft decided to fund the developers to make the game significantly larger. So the team set about adding in platforming sections, which have, unfortunately, demoed poorly. Now the game is due for release this year and, surely to God, we will get an official release date at E3.
Aside from Cuphead, the ID@Xbox program will inevitably make a return this year to showcase all of its upcoming indie games. We Happy Few, Below, and Tacoma are just a handful of announced games for the Xbox One, with no full release dates as of yet. These games should be showcased at E3, alongside a handful of exciting new titles to play.