AGP versions of RV610 cards are almost ready. We will see the first versions of these cards in August and some ATI partners did promise to have these cards out some 20 days after the PCIe release.
This sounds like they meet the timing. The AGP cards will be only a few bucks more expensive as the end user have to pay for the different PCB and the bridge chip that will make AGP card possible and it retail market you should not pay much more than $10 to $20 more than you would pay for PCIe card.
We can forseen that these cards will make many AGP system owners happy and for about €100 you will get DirectX 10 support that nobody really needs today to AGP market. It still sounds cool when you say it to your friends that you have DirectX 10 system and this will make this sales go.