Last Updated: July 7th, 2012
Jelly Bean isn't a huge evolution of Android like previous updates have been, but that's understandable given just how polished the OS has become. Still, as the company showed us on day 1 of I/O, things certainly have moved forward in quite a few ways (Ron provided a deeper look at some of them in his first Getting To Know Android 4.1 post).
Last Updated: October 3rd, 2012
After upgrading my Galaxy Nexus (GSM) to Jelly Bean last night (I know, I know, I'm a few days late), I unlocked its bootloader (the usual fastboot oem unlock) and commenced rooting, which I thought would only take a minute or two. However, after almost 2 hours of pushing, flashing, rebooting, and trying no less than 5 different root methods, I still didn't have root. Something must have changed under the hood, and no root method I was trying was working (even PaulOBrien's SuperBoot).