I do know that there were leaks of 5.0 of some 83xx models. However, I also heard that the builds may stop there. Those builds were NOT stable at all.
The difference between stupidity and genius is that genius has its limits.
When you take things for granted, the things you are granted, get taken.
Even a mosquito doesn't get a pat on the back until it starts to work.
Too many people miss the silver lining because they're expecting gold.
[BES 5.0.3 / GroupWise 2012 HP2]