No. I'm not involved with Google or Chrome but I follow a few tickets. 4, 5, and 6 are just milestones for project planning. Version 6 is about feature parity

No. I'm not involved with Google or Chrome but I follow a few tickets. 4, 5, and 6 are just milestones for project planning. Version 6 is about feature parity across platforms. They've been cranking on code quite intensely and therefore hitting the milestones quick. This last v5 to v6 change was a little surprising as the browser skin changed, but there are no major features that make v6 wildly different from v5. It's just a continuum of tiny updates silently getting applied in the background. It has nothing to do with Firefox 4 or IE 9.