You won't see 'better' deals price-wise. They put a percentage discount on refurbs of current models, and a slightly higher discount on the previous models.
When the current models are replaced by i5 MBPs, you'll likely see the same percentage discount applied to today's MBP models. You'll just get a slightly faster C2D model than you see in today's refurb section.
So basically, waiting will give you slightly faster refurb hardware, since today's models will be put on refurb AND it will become an older model.