Review of JB on NS after running it for 2 days:
1. I don't feel any difference in UI smoothness, maybe its too subtle to be differentiated.
2. Google Now seems overrated, it can only show 3 cards for me now, weather, direction and traffic (which I can't seem to find out how to configure to tell it that I don't work on weekends), and appointments.
3. The speech recognition seems to have improved, it can now recognize some of my speech even in the car.
4. Real Football 2012 seems smoother now, not sure whether its JB or its the kernel (I am still using the port)
5. Chrome seems more laggy while using it to view Facebook!
That's about it, a lot of small features here and there (like setting that a wifi is hotspot and should not be used for those settings that have been set to "Download via WIFI only" etc) but didn't effect me.
Hopefully there's OTA this week.