The leap from 08 to SSE is clearly going to be much greater than from 06 to 08.
Notice that Frank didn't really go into that much detail about content, save for a general variety of themes... But it is interesting to hear of a longer term committment to SSE, instead of considering it a stepping stone to, say SSE2 in 2011...
I think this means they're now happy with the game engine and methodology of delivering the sim. If sales go well, I wouldn't be surprised to see add ons becoming available at a more 'progressive' rate than with 08...
They're going to opposite way to most developers- EVolution rather than REVolution... Well done to them on that decision.