There's a chance of it coming to PS3, in the game informer issue they said there would be a PS3 version unless there's some money on the table. Besides the PS3 is like 1 year away or even more, why would they start the porting now and neglect the PC and X360 versions which are due this holidays.
Other factors are, 2K games is the publisher and they're extremely multiplataform oriented, just so you know Call of Chtulu: DCOTE was only for Xbox and PC, once they adquired it also became a PS2 title.
Also have you guys noticed this?
http://ps3.ign.com/objects/702/702492.html
Thats not the weird thing, the weird thing is that when you use the search games function in IGN searching for "Oblivion" the PS3 version never comes.
When IGN reports an axed game they write in red letter "this game was cancelled", in this case they "took down" the page but its there, just its impossible to find unless you use a search function on Yahoo or Google.
Anyway I would LOVE a PS3 version cuz this game is whats keeping me from getting a PS3 and considering a X360, things would be much easier if a PS3 version would be announced.