It begins. Zavvi appears to be the first retailer to break cover with a retail price for the Xbox One, calling the newly-released console at £399.99 with a November 30th release date. This seems to tally with several $399-$499 predictions, but of course, it could well be wishful thinking or supposition on Zavvi's part. Still, that's a convincing banner.
It's probably too early to make a judgement call on the RRP, but how much would you be willing or able to pay for any next-gen console?