No, we have no information about who the love triangle will involve, but most people are assuming it’s Mako/Korra/Bolin. I’ve only vaguely heard about this Asami character, I have no idea what role she is playing.
Personally, I’m not keen on love triangles at all. It is so rare to get a satisfying narrative conclusion out of them and there is the obvious point that someone tends to be disappointed. But then again I do like Mike and Bryan writing so maybe they’ll do something good with it.