If you have enough money and can find one, its likely for sale.

Rotarys occasionally pass through ebay, but most of the ones I've seen have been Le Rhones.
You start by asking aircraft museums if they've been offered one, or have one they'd consider deaccesioning for the right price.
I doubt there are plans for it, as far as I know the only reproduction rotary is the Oberusel built by The Vintage Aviator Ltd. (funded by Peter Jackson). I'd imagine that was a very expensive project.