With Singer around, I'll not panic or anything, yet, but unless this is deliberately building to FC2, I fail to see how setting it after X3 is any kind of plus.
If they made a movie between XMO:W and X-Men 1, there's literally nothing they could do in terms of character development. At the end of Origins, he's freshly amnesia-ed with nothing but his leather jacket, and that's how we find him at the start of X-Men.
What would be the point of a movie where he has to finish the movie exactly the same as he started? It'd be too much of a slave to the continuity that we complain about.
Imagine having to shoot him in the head again in "Wolverine" to set things right for "X-men"