Since it has been more than 12 hours since I first mentioned this in the forums and at that time this new feature was being worked on, I would now like to point out that this new blue Admin bar on the WordPress.com homepage lacks the ability (at least in Chrome 23) to click on it and be brought back to the top of the page. When in any of the homepage tabs that have infinite scroll, this is an absolute must!
Also, as another user pointed out in the forum thread I linked to above, getting to the Dashboard of a particular blog when on the WordPress.com homepage now takes extra clicks since you can no longer use the dropdown menu from our gravatar icon to get there directly.
Personally, I would much prefer to have a consistent UE and site navigation as with the current gray Admin bar everywhere else on WordPress.com.
As an aside, I notice that when posting a new thread in the forums, one has the option of receiving followup posts via e-mail. Why not give this option on the "Contact Support" form, since in any event the majority of posts submitted there end up in the forums?