It's tweaked for future devices? The OS is only going to be around for another year or so before WM7 is released (if it stays on target). Again, what you fail to recognize is that this is about WM6.5,
not 6.5.1. If MS released officially 6.5.1 as 6.5, the reviews would be absolutely different (just marginally improved). But they didn't. They are going with 6.5 and it's going to fail. There's no point of them even working on WM 6.x at all because nobody uses it. The majority of people who buy a handset are using the manufacturer's custom OS (see HTC TouchFlo, etc) and they never see the light of 6.5.
So lets be honest here, they tweak the OS for faster devices with bigger, capacitive screens. They can add pretty check boxes and left/right scrollbars instead of tabs. They can add pretty graphics to the task bar instead of showing ugly text. But in the end, we're still getting an operating system that's essentially unchanged since Pocket PC 2000.