I got a Google wave account. Didnt research much. Not sure how it is going to be used. Is it going to help SEO?
I don't think they'll use it in the very first years. Google isn't the big wow that they expected so at the moment, you can just use it for traffic purposes only and ofcourse, to keep up with friends
Google wave won't help you in your SEO. I suggest you to use google buzz instead of it. It can be one of the most effective promoting tool.