No, Xbox 360s haven't magically become irrelevant now that the Xbox One is out, but developers are starting to make the transition all the same. For a game like Super Time Force, it makes total sense that it would release across both systems.
Capy will self-publish its side-scrolling shooter on Xbox One "a few months into 2014." As a result, the Xbox Live Arcade version won't be done this year as previously expected. Instead, it will be out at the same time as Xbox One -- that's the plan, anyway. A long wait made even longer, but Super Time Force should be well worth it based on how well the game shows at expos.
There's a bit of footage in this trailer, as well as another look at the studio's other Xbox One game, Below. Both are shaping up quite nicely.
Xbox! Go to Capy Games! [Capy]