If this appearence of hide is meant to be so amazing that we "won't believe what we're about to see" then I think there's a possibility it could be be something like the hide hologram again, except playing between the actual Guitarists.
For example, remember that pic of the indoor ballroom, with Pata and Heath playing guitar at the top of that cylinder stage, they might edit hide into the shot between pata and heath so they're all playing their guitars together.
It sounds a bit out there, but I'm thinking of something that could match up to the statement "fans won't believe what they're about to see", and simply footage from a previous hide music video or a large picture on the wall doesn't match up the hype within what Dean said at all imo.