After reading this thread I did some digging on the net and was able to find the new 4.5 OS. I have not installed it on my device but from what I have read from others who have, it does seem to have some issues.

There is a bug that makes sending MMS messages impossible. Also, others have complained about trouble with their email services as well.

When I have a chance to play around with it some more I'll make sure to post back here. If you want the OS, do some searching on some Torrent sites and I'm sure you'll be able to find it.