The 200 series is a part of the Never Settle Forever program according to Linus on his latest video review, at least the 280X is anyway. I didn't watch the other ones.
I saw that too, but all of the other reviews are saying different. I gotta say the Linus overview and review were pretty weak sauce, I was hoping for better...
2GB 7Ghz GDDR5 is not cheap. I assume thats why they went 512bit and lower clocks with the 290/290X as well.
True, I didn't think about the 7GHz side of it, as most GDDR5 modules won't hit that.