I think all the pictures i've seen of the ASUS board include the x1 slots, so hopefully they didn't pull an MSI on this one. On the other hand, the Ultra board has an extra PCIe x1 slot, and costs 40 pounds less ($80, is that right?), so I'm not sure which one to get.
As for the x1 slots, I completely agree with Thermalrock. They are crucial, more important than the PCIe graphics, even. All the people in these forums seem to be getting so swept up in SLI fever that they've lost sight of what is really important. The fact is, probably 90% of people looking into SLI are looking at it as a cheap way to ensure a good upgrade path. Only the remaining 10% are actually gonna spend $200+ on a mobo and then shell out $1000 for dual 6800 Ultras (more considering the current markup on them due to limited supply). For the vast majority, SLI is just an added convenience, a way to be sure that if the next generation of hardware is underwhelming, you'll still have a way to boost performance for cheap, rather than getting stuck paying loads of money for essentially a clock boost, like the X850 etc cards will be. (Oooh, 540/1120 versus 520/1080, where do I sign up!!!). However, if you force these people to pay a large premium for the upgrade path, or make them wait months longer for the upgrade path, or remove another upgrade path to make room for SLI, then the value is gone. PCIe x1 slots are an upgrade with no alternative. When Creative releases their new PCIe-only Zenith sound cards, or new HDTV recorders come out, or controllers for SATA-III, 10GB ethernet, 802.11n, 802.16 (wimax), and future USB and firewire specs are all released, you will only be able to get them if you have PCIe. With graphics, on the other hand, unless the entire industry comes crashing to a halt, you will always be able to find something faster, for cheaper. Maybe the in-between releases are underwhelming, but every year or so, there is a new core that puts old hardware to shame, whether it's through improved architecture, pure speed, image quality, or new features, and if you wait long enough, your window will pop up. Maybe being able to double your cards as a contingency plan is a nice bonus, but it's hardly worth never being able to have a high speed peripheral in your computer EVER. It would be like buying an ISA based computer 10 years ago with an AGP slot but NO PCI slots! Can you really say "oh, we won't need the PCI slots, ISA will be just fine." No. (yes, I know AGP wasn't out when PCI first came out, but it's the closest parallel I could find).
Anyways, don't let the mobo makers win, if this is their decision. If it's just MSI, then don't buy their SLI boards. If Asus does the same thing, don't buy theirs, either. If they want to cut out features for no reason, we need to let them know we won't put up with it, and the easiest way is to cut into their wallets.