The official word:
"With respect to ISA, here's what we're public on:
- SBS no longer will support being the edge box. You'll need SBS to be behind a network firewall of some sort -- could be a hardware firewall, could be a software firewall, such as ISA.
- ISA, itself, will no longer support running on the SBS server itself -- this is really related to #1. We're building the SBS tools in the next rev assuming that the network firewall is elsewhere."
I wish I was allowed to say more about what's going on in the next version of SBS but I'm not. So from the official statement above it doesn't take a rocket scientist to notice that you're going to have to place your ISA server in front of SBS next time around on a seperate server. Unfortunately there's no public statement about what this means the product list is for SBS Premium because obviously we're going to need another license of Windows for that second server. We'll have to wait and see.