I said none, for three reasons:
1. Ninety Dollars extra can pick up a lot of other stuff at Gencon that I won't see around here.
2. The SRD will contain the most important changes, and will suffice for my gaming for the first few months.
3. There are several people in my group who will likely be buying it sight unseen, and I will get a chance to look over it then.
If I cannot find ANYTHING more worthwhile at Gencon (that's a pretty ludicrous statement, I know, but very possible), I would change my mind.
Will I buy them eventually? Yes, probably August, or September or so, I will suppose. But between Arcana Unearthed, Testament, The new D&D miniatures, gifts for the family, and the scads of new games that are always available at Gencon from 3rd party publishers, I will have my hands full without spending the extra dough on the books.
The scary part for WotC is that it is ENTIRELY POSSIBLE that 3E revised will do more poorly at Gencon than away from it. Most of the attendees are fairly Internet-savvy folks, and those who are up on all the changes will possibly wait (like me) if they are on a budget (like me.) In all likelyhood, it will be a HUGE smash still, but I will be curious to see what the final impression is by people like Peter and Ryan.