This is a new card product that was just launched by Barclays. If you go to www.myblackcard.com and click on the "Customer Service" link, it will lead you to a FAQs with more information on the card. The most surprising thing I saw was that the included Priority Pass only includes 2 visits per year!
Their problem here is they have a [crappy] product that has absolutely no viable customer.
They have a card with a $495 fee, which as cards with fees go its in the top end, but then their benefits are not even remotely close to what Amex Plt has for example.
Then they try to play off the "exclusive" aspect with the whole only 1% can get it, well that's 3M cards if you estimate the US pop @ 300M.
So now they need to 3M people who:
a) are willing to pay $495 for a CC
b) to dumb to realize that for the same price there are alternatives that offer a far superior product or
c) someone who just has so much money they don't quite much care.
I'd suggest the number of people who fit into a&b is quite small, so the good news for them is they can feel even more exclusive
People that fit a&c probably already have the "real" black card.
Programs: Amex Platinum, Starwood Gold, VX Visa, VX eLevate, Visa Black Card, Star Alliance Gold
Ironically, I'd be willing to venture a guess that Amex CENT has somewhere around 1% of the US population. I vaguely remember reading that PLAT had around 6m members and CENT 1-2m. It's come a long way from the days of CENT saying that there are only 10k members worldwide.
I feel like Visa must have something up their sleeve with this. They're not a dumb company, and they know people aren't going to pay $495 a year for two airport lounge visits, some random gifts, or concierge use (unless the concierge is top-notch, and not the usual Visa Signature concierge or the Circles concierge that AMEX uses).
Barclays is a smart and great company, I'd be pretty shocked if there wasn't more to this, other than the card being made of carbon fiber.
Visa Signature (at least my Capital One one) uses World Access.
My Citi cards (Premier Pass Elite World Elite Mastercard) uses VIPDesk though. I've never actually used it so I can't speak to how good/bad it is.