I would much rather get my information/feedback on IE7 from independent reviewers/sources rather than the marketing hype, MS said similar things about IE6, everything from improving your internet experience to contributing to world peace (well perhaps not that).
At this moment in time I don't believe that this early even MS know exactly what will be in gold release version of IE7, they may well have plans to include lots of functions, but it wouldn't be the first time things have been dropped as deadlines slip. Longhorn/vista was meant to include a new file system to replace NTFS but this has been dropped.
There will no doubt in the next few months be many independent reports on the functions currently in IE7 beta1 and how they acquit themselves, that is where I will be looking.
We will ultimately have to install the final release of IE7 as it too will be an integral part of the OS, but I will be in no rush even when it goes gold. As for using it, that is a whole different ball of wax, I will probably stick with firefox.