OP, I think you made a rational & smart decision because if you get it and don't like it, it's hard (expensive) to undo. But if you wait until you see it & test drive it, you can always order one. I don't believe demand will be that high and you should be able to get one later in 2021 if you decide to
In my case I'm planning to order an AWD but I want to see the G80 in person and hopefully in a few different colors and wheel designs before I pull the trigger. If I decide in March/April I'm think I should still be able to get a summer production AWD. Maybe I'm too optimistic.