TBS also announced that they were filming during the Farewell 1 DVD, so I'd assume there'd be some sort of indication on the day. I would also assume it will be somewhere more glamorous, such as LA or London, as opposed to some of the smaller or less desirable places they're playing, such as Leeds in the UK (wrong side of the Pennine Hills
), purely based on marketing perspective. I can't imagine, if this is their last extensive tour, that they'll do nothing; they have a huge, loyal fanbase, and I honestly think they are one of the biggest bands of all time. Also, if some are to be believed, I'd assume Mr Frey and Mr Henley wouldn't mind the extra money in their pockets too
(It would be unspeakably awesome if in secret they've collated footage from their entire tenure, and release 7 / 8 concerts in one go. Alas I think I'm in the realms of fantasy.)