unless they say otherwise whenever they make the announcement. it could go either way. you'll just have to wait for a very long time before they make their announcement from Pasadena.
1. You call Apple store and find out. It depends, but it could arrive by weekends.
2. Shared video memory was not apple's fault on 13 MBP because intel doesn't allow nvidia to make integrated graphic chip for sandy bridge. They did not license nvidia.
Apple went core 2 DUo last year because of this. There is no room for dedicated graphic card.
Why don't you show apple an way if you know how they can put in dedicated graphic card in 13 MBP?