Steve,
The only crystal ball involved is the assumption that if bizgres has Neat Stuff(tm) that would be of widespread use in it's development tree at that point then the odds are good that it, or something functionally equivalent to it, will appear in the 8.2 developmenttree.
It certainly won't be because it hasn't been submitted. All features for Bizgres PostgreSQL (as opposed to the proprietary MPP) will be sent to -patches. The main difference will be the release schedule.
--Josh