So far, I think only one gun is slated to come out for this promising new round. That would be the Ruger SP-101. My guess, based on a review I read on the three-inch barrelled revolver, is that this could be a piece quite worthy of considering. I don't remember offhand the bullet weights from the review, but it is a little lighter than the typical .38/.357 projectile. My guess is that it probably equals or surpasses a .38 standard load, but might not offer much advantage over a +P .38 load, and .38 ammo is, for the time being, much more readily available (and cheaper) than the new load.
I like the .357 Magnum, and I think I'd like the new .327 Magnum, too. But, given the choice between .38 Special and the new round, I stick with the .38 Special, especially considering the +P option.
If you're considering a revolver in .327 or in .38, I'd suggest you add the .357 Magnum to the list of possibilities. If it were me, I'd then have a good, capable round (.38) that also can double as a Magnum for hotter loads when I want them. Of course, the .327 can handle other, more readily available rounds like the .32 H&R Magnum, and the .32 Long Colt. So, at the end of the day, I guess it comes down to personal preference.