It looks like the V2.5 is almost identical to the V2, except for the swirl design in the hand grip and the Provari logo isn't etched anymore, but machined into the side. I couldn't find anything that detailed new features or higher amperage ratings. It seems to be mostly cosmetic. Satin is on sale for $159.95, BTW.
My V2 logo hasn't worn off in a year's daily use. I slide it in and out of my jeans or jacket pocket over and over all day and it rides there while I'm walking around.