This might be a bit harsh, but revolvers are dying. They will always sell, but new gun owners are buying semis, and old gun owners are switching in some cases. My dad, a long time S&W fan, now has a P229 on his nightstand. Dark as it may be, when these older generation shooters start going away, so will the revolver following.
That said, within the shrinking revolver market, the .327Mag is not established. I love the round, but I don't have any. I wouldn't buy the gun until I was confident the round was going to survive. I think a lot of people are in that position. If I were a business executive with a stake in the round, I would be flooding the market with very cheap, or free guns. Donating them to every charity raffle I can. Get the guns in peoples' hands, legitimize the round, and then sell the guns to people like me who were just waiting for someone else to take the risk. It's a chicken/egg situation really.
But, considering the revolver market is most likely shrinking, I think a new round that only works in revolvers is probably never going to succeed unless it somehow introduces advantages over a semi that weren't there before.