I actually don’t think it’ll be that high, but it seems to be the general assumption for the higher end series X. I’ve seen that figure used by a couple of folk who’ve been pretty spot on in the past and are generally careful about what they say.
I think it would be suicidal to come in that high though. They only thing that makes me wonder if there’s something to it is the fact that they’ve introduced this phone style monthly payment system and upgrade system.
Edit: and the fact that they’ve said there won’t be a series X exclusive for quite some time. They’re setting the series X up to be a seriously premium option for Xbox users. It all just feels like grist to the early adopter mill.