They are typically pretty big with a mix of newer games, conversion junkers, and a number of classics thrown in for good measure. I have attended a bunch over the years, and some real gems show up from time to time, but it can be hit or miss.
Also, they usually have at least 2-3 months inbetween auctions, but the previous one was held in September...not sure how that short window will affect the October one.
You can see some old, partial price lists at Dave's site: