Emacs chooses Bazaar

Drupal is neither a "blog software" (more a general purpose web app 
framework that you can bend to do everything you'd like to) nor is it 
using Bazaar. There's a Bazaar-powered Drupal import mirror on Launchpad, 
and some developers use that one to create patches, but that's it. 
Everything "official" in Drupal still runs CVS.