I want Haruu in Team B myself, or failing that, A....
Having said that, I see a lot of speculation from Japanese fans that it could be Sano Yuriko. She doesn't really have a Team K image though. I'm personally hoping that they don't promote a girl right away, because I really like the research students are they are right now... but with the next generation coming in very soon, it seems likely it'll be promotion time for someone.