I sold my 1200gs after about a year. It was good on the road but just too heavy in the dirt. Also, didn't like those shin bangers hanging out there.
I bought a used 650 gs earlier this year. I commute to work on paved roads (low 60's mph fastest) and finish on a rough gravel road. I like the lighter bike as it's more nimble and no shin bangin'.
This 800 could be the sweet spot as it looks to be similar weight to the 650, perhaps better suspension and a little more power for around town.
I voted wait and see. See how many teething problems it has and wait for a good used one that someone trades in for a 1200
(that's how the 650 I bought became available).