Tigress hugged Po first and she never hugs anyone

IKR!!! XD

Nope! I think it was just close friendship that's all.

Eh..... Close friendship has my vote atm.

At most, there were hints of a possible relationship, however, because the two are different species, one could say that the extent of this relationship would reside somewhere within infatuation, given the assumptions that Po and Tigress did, in fact, harbor feelings for the other. In retrospect, their affection and admiration towards each other would extend to nothing more serious than your typical, average high-school boy/girl crush.

Hugging your friend doesn't means that you're in love!!!!