After the main Windows 10 preview update installs on your phone there's a second one to keep an eye out for. We've just received a "fast ring configuration" update that while we're not absolutely sure of what it does, it's obviously an important update for everyone in the fast ring.

If you didn't see it yet, go ahead and check in Settings on your phone, if not, no need to panic, sit tight and it'll show up if and when it needs to on your phone.