What is .81x?

Is that the new patch after .81a?

There isn't any. If you've got 0.81aV2 you're as up-to-date as anyone can be in public.

I saw that somewhere around here too. A little confusing, but I think they just meant any version of .81 i.e. .81, .81a,.81a V2.

Only healthy stubbornness stands in the way of an official EB 0.82.