I suspect I'm going to pick it up. As I remember, so far as first person shooters in general go, BOB was actually pretty poor. The western setting made it stand out enough for me to like it. Maybe that won't be enough this time (I'm certainly not blown away by the trailers I've seen so far), but it could be.
This also got me thinking (probably not the first with the same idea), Far Cry 3's engine could make for a splendid cowboy fps. Ahem... could even just reskin FC3 a bit, thow in silly plot and some simple cut scenes, sell it for $15, and I'd be all over it.