From what I see and what I know, the game will come out around spring 2008 or later, and certainly not earlier than Christmas.
And it will require a at least a Core2, 2GB RAM, a new videocard as well, and would also be wise to wait until the first 2-3 patches are out. So, some time before you will be able to really enjoy it.
But it looks like this is the flightsim to have in the years 2008-2015 ..
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