It's been less than a week since Microsoft released a new build for the Slow ring of the Windows Insider Program, but PC build 15063 is available now. There won't be any new front-facing features that you'll see; instead, there are a number of fixes.
The frequent builds, fixes, and lack of new features is due to the fact that Microsoft is finalizing the Creators Update, which is slated to arrive in a matter of weeks. In fact, many are speculating that 15063 is indeed the RTM, as it's now available for phones in the Fast ring, PCs in Fast and Slow, and Xbox One consoles in Alpha, Beta, and Preview Ring 3.
Of course, Microsoft will likely never actually tell us that it's the final Creators Update build; it never does. Instead, you'll see it get promoted to the Insider Program ring reserved for updates that will roll out to the general public - the Release Preview ring.
Build 15063 has only been available in the Fast ring for three days, and you can find the list of fixes and known issues here.