Update. I made another Mod in addition to the Magnet Fix. I was reading up on other iPad 2 Cases being used on the iPad 3 and some people reported back that on some cases, it would mar the aluminum a bit. While this was not happening to me, the fit was just snug enough to make a bit nervous that over time it could. So, I gently peeled back the felt over the foam back and removed all but a 1.5" x 1.5" strip of foam in the center. I cut this strip with a knife on either side and then removed about 2.5" on each side. I left the center strip to give just a bit of resistance. The adhesive was very sticky so the felt laid back down and stuck as well as it was when I pulled it up. I slid the iPad 3 back in place and it went in very easily, as the stress on the edges was relieved. I am now very happy with it.
I really believe that Zagg has probably only removed the foam under the felt and changed the magnet configuration in the ZAGGpholio for the iPad 3. This is why the specs have not changed on the outer dimensions they show on their site.