...Seriously of all the MacBook models the MBP 13" has the least mineshare for me.
That might be true if you think that the only change to the MacBook Pros was going to be the shift to the Sandy Bridge CPU. However, if the 13" MacBook Pro lost the optical drive then there would be no reason why Apple couldn't add a discrete GPU to that model. Then top that off with a larger battery and the Sandy Bridge CPU and you've got a very clear distinction between this newly designed 13" MacBook Pro and the remainder of the non-Pro MacBook line (which will retain the Core 2 Duo processors and integrated graphics). If Apple dropped even a halfway decent, discrete GPU into a newly redesigned Sandy Bridge-based 13" MacBook Pro then I'm pretty certain that this model would quickly become the system of choice for most prosumers (unless they really needed high-end graphics and a larger display). Apple would probably be able to raise the base price by $100 to cover the improved GPU and significantly upgraded Sandy Bridge CPU.
That leaves the 11" MacBook Air as the only price-matching alternative to the old-school white MacBook and quite frankly I think many would choose the 11" MacBook Air over the current white MacBook (given that both use Core 2 Duos with the same integrated graphics). At that point anyone who was unhappy about the 1.4GHz CPU in the 11" MacBook Air could probably be convinced to purchase the faster-clocked and better-displayed 13" MacBook Air for $300 more (and also gain a larger SSD). They might even be convinced to buy one of the new Sandy Bridge-based 13" MacBook Pros (it would largely come down to a decision between weight/size and processing power, since both would likely use the same 13" 1440x900 pixel display).
Given the above here are some potential configurations and base price points (all unchanged from today's prices, except my suggested $100 increase on the 13" MacBook Pro):
13" white MacBook (Core 2 Duo, NVIDIA integrated graphics, HD, CD/DVD): $999
11" MacBook Air (Core 2 Duo, NVIDIA integrated graphics, SSD): $999
13" MacBook Air (Core 2 Duo, NVIDIA integrated graphics, SSD, SD card slot): $1299
13" MacBook Pro (Sandy Bridge Core i5, NVIDIA/ATI discrete graphics, HD or optional SSD, SD card slot): $1299
15" MacBook Pro (Sandy Bridge Core i5 or optional i7, NVIDIA/ATI discrete graphics, HD or optional SSD, or optional HD+SSD, SD card slot): $1799
17" MacBook Pro (Sandy Bridge Core i5 or optional i7 with up to quad-core, NVIDIA/ATI discrete graphics, HD or optional SSD, or optional HD+SSD, SD card slot, ExpressCard/34 slot): $2299
Note that the 15" and 17" models offer a new dual-drive option, one SSD and one large-capicity HD. This is made possible by the removal of the optical drive and as a bonus you'd probably get a bigger battery (just as with the new 13" MacBook Pro). The removal of the optical drive would also offer some other possibilities, like more USB ports, adding an ExpressCard/34 slot to the 13" and 15" MacBook Pros, and physically separate audio in/out ports on the 13" MacBook Pro. This would mean that all of the Pro models could have exactly the same port configurations: Ethernet, mini DisplayPort, Firewire 800, three USB 2.0 ports, ExpressCard slot, SD card slot, analog/optical audio in port, analog/optical audio out port. Frankly, with this lineup of MacBook Pros and the current MacBook Airs (which won't be changed in this same upgrade cycle with the MacBook Pros) I really think it is pretty obvious that the white MacBook is nearing the end. It will probably only be kept for the cost-sensitive and K-12 education markets and the people who don't understand the advantages of an SSD and who see no benefit in a smaller and lower-weight system. Basically, it will be for those people who look at PCs and Macs and can't really see any difference (or who don't care about the differences).
The only price difficulty I can see from the above is the jump from the low-end $999 models to the 13" MacBook Air or Pro starting at $1299. If that proved to be too large of a gap then Apple could offer a 13" MacBook Pro without the discrete graphics at $1199 (this would rely upon Intel's integrated graphics in the new Sandy Bridge CPU). The latter would restore the pricing structures that we have today.