Hard to know how it'll play out to be honest. I'm speculating like others, but I'm looking at what happened with the SGSI and Nexus S last year, and Samsungs own official statement that the hardware configuration for screen and CPU will differ in some markets.
I expect it will release in the home Korean market several weeks ahead of any wider release (UK and some parts of Europe being first in line after Korea, as it was for the SGSI), and in that market and the UK market I expect it'll be the Exynos/SAMOLED+ configuration, which Samsung will see as the 'premier' hardware configuration. Only reason for this not to happen would be problems with the production of the Exynos CPU, but I don't think anybody but Samsung knows how production is going, so its all speculation. Definitely means that there is a chance that the first off the lines will in fact ship with Tegra's.
I don't really think I care which dual-core I get to be honest, pros and cons to each. I think there are still plenty of reasons to get the SGSII even with a Tegra over other dual-cores: best camera, best memory capacity, best screen, best video playback, MHL, WiFi-direct, BT 3.0, USB OTG...
Not sure who will miss out on the SAMOLED+ screens, I suspect that Australasia will, as it has done with the Nexus S. Thats a far worse handset configuration, and I don't think it'll happen in the first few markets the SGSII is released into for obvious reasons.