Avalanche Studios the Swedish outfit that have given us Just Cause and Renegade Ops are working on project(s) for Xbox One they've confirmed on Facebook:
"After last night's reveal event, we're happy to announce that Avalanche Studios is indeed developing for Xbox One! Looking forward to making the leap into the next generation."
The studio is rumoured to be working on both Just Cause 3 and a Mad Max game and have been hinting heavily at an E3 reveal for at least one of these titles.