I said like a Nagant. See 402's link for more info.
Exactly.
The nagant revolver uses a special cartridge with the bullet seated all the way into the brass. The gas seal is done by pressing the lips of the brass that extend past the bullet into a forcing cone at the end of the barrel. So any suppressable revolver would have to either use the existing cartridge, come up with a new one, or come up with a way to form a proper gas seal with non-specialty ammunition.
But yes, I too would love to see a new suppressible revolver. Hopefully one that doesn't use the 7.62 nagant cartridge, since it is very underpowered.