The PlayStation 4 has already seen its first post-launch firmware upgrade; now, it's the Xbox One's turn. Microsoft is about to roll out a system update that will fix several glitches, including problems with SmartGlass when entering or exiting standby, difficulties rejoining multiplayer games and various inconsistencies with Dashboard performance, notifications and WiFi. You can upgrade your Xbox One at any point after 8PM Eastern tonight, but we wouldn't be too leisurely about it -- the patch will be mandatory after 7PM on December 12th.
Update: The patch appears to be rolling out, although some report they've had to turn their system completely off (hold the power button on the front of the console down for several seconds) to pull it, and others still aren't seeing it. An Xbox.com support document spells out the 6.2.10217.0 (xb_rel_launch.131205-2200) update's current "available" status vs. mandatory and what the process is, but one way or another everyone will be seeing it in the next couple of days.