We dont know yet
You need to use stock Android recovery or the OTA update.zip will fail the integrity check.
I dl'd ff02 installed worked fine. When I tried to connect the phone to my computer I kept getting driver errors and the phone would not be recognized. It seems that FF02 (maybe other ics leaks) only has the MTP and PTP but not the USB Mass Storage (which is the only way I can connect to mac/pc and transfer filles).
Are you guys having any issues with FF02 like this and how are you xfering files back and forth from phone to pc and back?
Once I went back to EL29 the issue went away. I realize it's an ICS issue, but I had no problem connecting my GNex and Razr to the computer and they both have ICS.
Thanks!
PS - Can you update FF02 from a rooted EL29
Yes.