soooooo does this basically confirm they are teaming up with curse for mods? and are we gonna be able to download any mods for the beta to test it out by chance?

Probably not, a lot of companies pick various sites to hand out beta keys when the game is getting closer to release date.

Curse is just a mod repository. They can't really team up with them for mods, since Curse doesn't make mods, they just host them for players that make them.