The question above is what I'm trying to figure out. Based on videos I've seen it looks like they do.

Yep, each race has their own animation set for each class! Pretty cool I think, gives quite a variety between players!

Play a male (any race) for super stiff and boring animations! Or a female Aman, they move sorta like human men.

Play females for more showy animations.

Play a popori if you want hilarity. Trust me you'll adore the funny things they do, they're so "fat" when dualwielding it's like they're spinning like a top cause their arms can't quite go around their bodies XD

Play an Elin if you really love acrobatics. They're the most "animated" and "showy" of all the races.

Would you know where I could preview them?

Search youtube for "Tera (Race) (Class)" and usually the first one that pops up is a quick starter zone video that shows some of their animations.

I was hoping one of the warriors would hold one or both of their weapons backwards D:

No. Animations are different yes. But say, if youre a priest, all races hold the staff in their left hand. If thats what youre meaning.

Well some of the classes I noticed hold their weapon differently while they run. Some cutscenes show warriors with a blade backwards and it just looks tight :p

Elin have the worst warrior animations, they hold their swords like popsicle sticks :/

this and the racials is why I'm considering having a male human warrior, male human warriors also have the best animations and leather armour of their class. Although this bodysuit http://tera-online.cc/uploads/gallery/main/69/popori_f_l21.jpg looks delicious. Sort of not sure which race I want my warrior to be. I guess I'll try both this closed beta and whichever I like more I'll play.

I love how the high elves look when they run, so I think that will be my deciding factor, the extra crit rate from cast. is attractive, but if I'm going to have some boring look I'd rather not.