Interesting. Not much made of it being exclusive at this point if true - and interesting the developer website is still banging on about developing games for next gen consoles, etc.
Given it looks to be strongly aligned to PC (the only constant in any info I can find) then going with 360 vs PS3 would be a no-brainer (which I happily say even as a PS3 owner).
Not sure how much money these guys have either so limiting development costs would seem prudent and if the initial development base was PC then gettting it to PS3 would add a resonable amount of cost/effort most likely.
Of course if its not exclusive other than by developer choice then I guess if sales are good they would be free to then decide whether to expand to PS3 or not (or conversely too I suppose, i.e. if sales weren't amazing they could move it to PS3 and try for some additional sales).
To be honest I don't really care as the game doesn't appeal to me (at least based on current info) and I guess I can get it on PC anyway if reviews are actually good.
Try to be reasonable... its easier than you think...
