Homika! <3 I don't know much about Shizui so there's not much I could comment on about him, but Homika is a whole different story. From her guitar alone it seems obvious she'll be using a Scolipede (the bottom of the guitar = tails, the neck of the guitar = horns, the colour is the same, etc :3) and her hair almost resembles a tied-up rubbish bag, possibly hinting at the use of a Trubbish? Based on this I'd love her team! Then hopefully she'll get a cool Pokemon or two from the previous gens, maybe an Arbok since her personality seems quite sharp and jabbing, and maybe a Toxicroak to compliment her love of music? I dunno, these are very rough guesses, but it's the best I can think of for now x]
Aside from Amoonguss' family, those are the only other two Poison-families in Generation 5. You may be dead-on of what she might hold for her Pokemon in Gym Battles. They just seem right for one another! But her guitar is sick!
I found some pictures, did some browsing. I'm going with, I think she might have Koffing with a Scolipede xD
But she doesn't seem to be the friendly type of person. And I think she will have only two Pokemon. Homika/Shizui, have they been revealed because they are the first two new Gym Leaders of Black and White 2? Meaning the next group will be Gym Leaders 3-4 and so on? We'll see!
Some pictures I found:
What do you think of the new Gym Leaders for Black and White 2: Homika and Shizui?
Homika will be interesting, a poison-type gym leader.. cool! Shizui seems alright =)