Xbox head honcho Phil Spencer took to Twitter answer a follower who asked when Windows 10 will launch on Xbox One. The reply, while not pinpointing a release period did go on to say that it won't be until after the summer.
"It will be post-summer."
Windows 10 is targeted for release on PC during the summer (free update for WIndows 8 users), but it appears Xbox One owners will have to wait a little longer. Please note that the update won't turn your console into a PC, but it is going to be interesting to see just how Windows 10 will be leveraged on Xbox One. Hopefully we'll learn more at E3 next month.