Is there going to be any improvement in Spam Assassin?
For Spam Assassin to be effective at the very least it needs to implement network checking (against black hole database and known spammers). The DreamHost installation doesn't do this.
Also, I have found it very useful to be able to tweak the scores for particular rules -- not available.
Another highly powerful tool is Bayesian learning in SA -- not available either.
The current Junk Mail filtering system is not effective. It's a major problem (probably the only serious problem I have with DreamHost, which is in other respects superior).