The last version I know of is CW Metro 5. I checked it out once, and thought it pretty much sucked. That was years ago.
There are much better apps for Mac. PT, DP, Logic etc. Just depends on what you want to do, and how you like to work. I prefer PT myself, but I come from the analog world. Logic or DP are better for sequencing though the latest version of PT is much improved in that dept.