It's passed steam greenlight, so once finished, should be available for a nice one click install. I look forward to this :)
But if you're reading this thread and excited, you'll probably get a kick out of it.
You can get a preview of the gorgeous Xen graphics in one of the rooms of the Questionable Ethics chapter.
I think plenty of us hated the Xen levels, and the BM:S team knows how challenging it will be to modernise. I'm looking forward to see what they do!