I wish there are still Macbook Pro 13", since I've been waiting for this for 3 years+.
If no Macbook Pro 13", I would consider Macbook Pro 15". But MBP 15" is very big and heavy. Even now, my MB Aluminum 13" is little heavy.
My prediction on MBP 15"
Ivy Bridge Processor, USB 3.0, nVidia Graphic Card, 500GB HDD (you know, harddisk price is very high now), 4GB/8GB RAM, Thunderbolt, LAN 1000Base-T, high resolution display (Maybe 1680x1050 or 1920x1200?), no redesign (or maybe little design modification).
If there are still a Macbook Pro 13", I hope the specification is:
Ivy Bridge Processor (Dual Core, Quad Core is better, but I think it's to pricey), USB 3.0, Intel HD Graphics 4000 (I hope for a Discrete GPU, even the cheap one, at least better than HD 4000), 4GB/8GB RAM, Thunderbolt, Lan 1000Base-T, high resolution display (maybe 1680x1050, Retina Display is not likely), no redesign (I still hoping for a big redesign)
For me, removing the ODD is a good idea. Make the Macbook Pro slimmer and lighter. Apple will not make it look like Macbook Air.