1) C++
2) It's clearer and allows for more powerful constructs (even if they're not being talked about yet).
3) Yes.
4) It depends on the number of writes but you can adjust the level of history to the level you want.
5) Great question. I'll have to circle back to this later.
6) The feature list above beats SQL Sever on each point.
7) Initially as a service but that could change.
8) The research stems from the Kayia programming language (kayia.org).
9) The feature set for the price. It solves a lot of back-end needs and yet is much cheaper.