What do you want to know from Beta?

[uffela]

1. I'm guessing that they will use the current API with some parts locked down - so macros and addons will be interesting
2. Character models and animations - it might be a deal breaker for me if the new models and animations can't be turned off.

[MiRai]

Character models and animations - it might be a deal breaker for me if the new models and animations can't be turned off.

I have good news for you - Neither will be present in the Classic re-release.

EDIT: I should be fair and say that anything is possible. As in, they could implement the new models into the old game, but, obviously, there'd be a toggle for such a thing if it existed. Right now, however, there is zero indication that new models will be present.