That's the Creators Update it's actually been out for a while now though they did do a rolling deployment.I've had it for a month with no problems.It is a major update so be prepared to check any settings you customized because they may have changed back to default afterwards.Here is a list of things that changed.
I have it running now, and it seems a little faster than before, but that may be my imagination. I see that it has Cortana, which I found a bit intrusive in the earlier version of 10. I'll play with it a while, but it seem to work like the older version. Must experiment.