Towerfall Ascension, and the Dark World expansion, will be released for Xbox One in the near future. Solo developer, Matt Thorson, confirmed the news via Twitter. Although he did not commit to a release date, Thorson did said he is already playing the Xbox One version and that it was "fantastic", which suggest development might be close to completion.
If you are not familiar with Towerfall Ascension, it's a highly entertaining local multiplayer game with minimalist visuals and mechanics.