It's looking good! shaving off 20W while having a 5-10% expected performance increase on the processor, and nearly doubling the onboard GPU is nothing to snuff at. That is absolutely amazing. Plus the added PCIe3, possible Thunderbolt(though this will likely depend on the chipset), possibly native support for faster ram, possible WiDi, and more. Part of me is kinda sad that I could not wait for it to come before upgrading, but I'm still happy with my 2600.
For whoever asked what the T and S modles are for: these are for special nitche markets, like workstation laptops, or specific use applications like kiosk setups and other things where they have a constrained power budget, but still need features like added cores, a larger cache, or hyper-threading. Most people would not want/need one.
They should have had a different name scheme with SB-E to make things less confusing. SB-E should have stuck in the 2xxx range for processor numbers, and left the 3xxx for IB chips. Sure the SB-E will be faster, but the IB and later IB-E chips are rather a different monster.
Cant wait for official reviews!