According to this site:
http://www.thesixthaxis.com/2009/07/10/ps3-to-pick-up-360-title/
Exclusive: PS3 To Pick Up 360 Title
By Alex C [nofi]
Whilst we can’t reveal any specifics right now, we can now reveal that the PlayStation 3 will play host to a popular 360 favourite. The title, which has to remain under wraps with us for the time being, will be released towards the end of the year. We’ve been promised more information in roughly a month’s time, at which point we’ll be able to share the specifics, first.
Our contact has also let us know that the studio will have other exciting news to share soon enough. Note that we can not talk about this further at this stage.
Have a good weekend. 
- I think its mass effect, just because recently bioware said how they were excited on developing on the ps3
