I think WordPress.org already had Gravatar support for quite a long time, but I’m also interested, if they do run 0.9 by now? 
mdawaffe’s most recent changes work for me. I applied the last patch he postet to that ticket and all warnigs disappeared.
Same with me, I tried a vanilla installation of bbPress 0.8.3 on my local machine, however, there is a slight difference:
I entered the ‘root’ as username in config.php, but the error itself is
Warning: mysql_get_server_info() [function.mysql-get-server-info]: Access denied for user ‘www-data’@’localhost’ (using password: NO) in /var/www/bbpress/bb-includes/db-mysqli.php on line 80
.
There does not exist a user called ‘www-data’ on my mysql-server and I am completely sure that I filled in ‘root’ in config.php.
Hmm, the ‘roadmap’ on that page shows 0.8.2 being completed (100%) for some days now, but ‘no date is set’… So when will we going to see that version as an official release?
