Nothing new in blinkfeed in terms of feeds in my opinion. No Google plus option in blinkfeed as well. NFC works now at least. haven't touched any of the settings yet but overall, not much for changes. Deal killer for me is that it won't let me import my outlook/exchange activesync contacts. Some reason they think they are facebook contacts, which they aren't. Besides 4.3 and a few other small things, its cool but was thinking there will be more, especially with blinkfeed. Also not impressed that they are forcing google music onto my phone when I don't use it at all, especially rubbing it in that I can't buy music from google play. Props to HTC but because of google apparent refusal and laziness to bring features (buy music) and devices (chromecast) in Canada as well as going to bring ads to mobile gmail, it's likely that i'm ditching android as a phone OS in the very near future.
Update, you can't uninstall google music either, just tried.