Installed it on two 2013 rMBP's, so far with few issues.
rMBP 1
- Installation changed halfway through, and apple logo was off centre (believe this was down to me not having the display at pure retina resolution, so looked like it was displaying a 1280x800 image anchored to the bottom left of a 1440x900 screen).
- Mail smart folders were removed, left with only Today. Was able to re-create them though with no issues.
- New Disk Utility application. Ran first aid just to check for any permissions errors, but didn't seem to report any.
rMBP 2
- Installation didn't have the same issue as rMBP 1, believe that's because the display was set at pure retina before starting the installation.
- Mail smart folders were retained on this computer.
Overall it seems like a pretty solid release (obviously this may change across the betas), all the apps I use regularly work well so far.
The new font on the fourms (San Francisco?) looks terrible on my external screen, but great on the built in retina display. The new San Francisco font throughout the interface looks really good on both though.