Major Nelson (Microsoft's Larry Hryb) took to Twitter today to announce that today's Xbox One update, which is set to introduce numerous new features, will be rolling out later this week. The reason for this delay is "the team is working on finalizing" said release, making sure everything is ready before the update is pushed out to Xbox One units.
The February update will bring controller battery status, better storage management and more. The Xbox team is listening to complaints and feedback provided by the community, implementing numerous fixes and adding new functionality in a batch of updates. We'll hopefully have more details soon on this month's update before the week is out.
Source: Twitter; thanks, Omar, for the tip!