Earlier today, Microsoft announced the next feature update for the Xbox One, which is version 1705. It adds a number of "fan-requested" features, many of which were announced for 1704 but never made it into the final update.
Now, the first 1705 build is available to members of the Preview Alpha ring of the Xbox Insider Preview, bringing the build number to 15063.3020, or rs2_release_xbox_1705.170411-1700. It should weigh in at 466MB.
The release notes don't list any new fixes or known issues; instead, they only link to the announcement from earlier today, which lists all of the new features. As with version 1704, Microsoft says that "not all planned features for this update are available at this time."
As the version number indicates, this update should be finalized next month in May, so if you're not an Insider, you shouldn't have to wait too long for it. If Microsoft follows the same trend that it did with the last update, those on the beta ring should get it within a week or two.