This is the most awesome update EVER!
except for one thing that caused me a one-second heart attack.... Please allow me to post this here just as a bit of a warning to anyone still updating:
had Facebook beta installed and apparently, WP 8.1 integrates only with the 8.1 FB App which should be downloaded, which i did.
So i uninstalled the FB Beta app. noticed my me tile disappeared, my People tile got messed up because all links were undone. I tried going to the accounts setting, but it would kick me out as soon as i accessed the setting. Needless to say, i panicked, and the prospect of doing a hard reset was something i did not want to do.
However, i did try opening the new FB app and then and there after logging in to FB, it asked me if i wanted to integrate FB with the phone... and this fixed the issues.... WHEW!!!
Anyway... this is such a refreshing update. It's a new experience, in my opinion! Love Cortana most especially! Worked exactly as demoed during build too!