Should be 12.5 if its 12 you'll get a free upgrade to 12.5 typically....as for whether or not its Vista compatible you'll have to check www.nemetschek.net
if you get 12 you may be better off, as 12 doesn't watermark your work and you have use it with the pro versions, which 12.5 can't. If they do send you 12, please tell me so I can order it too, as I am looking for 12.