My concern is that nobody over there seems to have addressed 'any' of the bugs that 6.5.1 has brought to us, including omissions from language files, etc.
That is one reason I have not upgraded yet. I don't have any serious issues with 6.5 - and it does not look like 6.5.1 is going to be 'fixed' anytime soon either.
I like the fact they are working diligently on the new product, but 6.5.1 just leaves me a bit uneasy.