I wouldn't doubt it. Singer is far from above recycling his own garbage again. Plus he seems obsessed with "correcting" Ratner's X3. And I dunno, people made such a fuss about, "If Singer had done X3 instead of Superman Returns, it would have been INFINITELY better than Ratner's movie!"... but how do we know that? If anything, I'd imagine it'd be slower and significantly smaller.
I wonder if Magneto will become the villain again?