v8 no longer has the footprints for the additional IDE RAID and FireWire controllers that have been there up to v7.x. Also, the onboard LAN no longer is a PCI chip, but the chipset's own LAN engine is used. Consequently, the board itself is a lot smaller.
In other words, it's a cost reduction thing, removing rarely ordered options, as well as making better use of the chipset. Less PCI chips and more chipset internal feature usage is a good thing - for both cost and performance.