It's called the "Forever Roll" with their signature ultrasoft 2-ply sheets and reportedly holds 850 sheets for a single-user roll. You can double it up with 1,700 sheets for a multi-user roll. The "Forever Roll" is so big it doesn't fit standard toilet paper holders, so you have to get the special dispenser with it.
The single-user roll costs $5.49 per roll for a one-time purchase, or $4.39 per roll when you sign up for a subscription. They say that these new rolls may cost more, but they offer convenience especially with a subscription. They are now available here.