I haven't heard of anything on CUDA 2.1. Right now barely any applications even use CUDA so until it starts to get very popular, news is going to be a long, dragged out process.
Special API so programms can run on the GPU instead of on the CPU.
I have a GPU and tried running some BOINC on it, it's too unstable as for now, as the whole computer crashes, so I haven't really had time to try CUDA out so much.
Have no idea when 2.1 is out, since so few apps uses CUDA