I've just been checking out the latest development version of Drupal 7 to see what this latest release will offer.
The official notes for the release are here: http://drupal.org/node/156281 [1]
It seems like the main user visible changes are improvements to the user interface for creating new pages.
I've created a screencast of Drupal 7 in action
Drupal 7 doesn't look radically different, better yes - but still basically the same thing. While I think this is in many ways a good thing I don't quite see how this amount of change justifies the Drupal policy of no backward compatibility.
From a development point of view each version of Drupal is a big step forward and certainly I would want to start any new project on the latest version.
Links:
[1] http://drupal.org/node/156281