My humble opinion: Weber beefed up the internals, added some simple features which they didn't do to begin with ie. Light, better casters, but kept the actual body/frame the same to keep costs down in the "new" model. This model debuts with the better software and firmware which I think they were testing on us when they tried to launch them on 1/4. At least the software is working (for some at least) Next will be an EX4 premium, and then they'll drop the original EX4/6. Hopefully we'll get the newer better internals when our rusts out within the warranty period. They're staying in the pellet business like Bruno said. Weber fans will have a Weber gas and a Weber pellet grill in their backyards and be faithful to the Weber brand. Just my .02