I just update to PR1.3 on my 64GB black Finnish N9. So far I can't see much of a difference. It is a little sluggish right now (as was PR1.2 when I first installed it).

All of my apps are there and I don't see anything that is missing.

All of my N9Tweaks have been reset though I haven't had the chance to try tweaking them again.

I did the whole update OTA in about 35 minutes.