DDR3 is set to ramp up with Bearlake chipsets towards the end of the year, so expect plenty of other manufacturers to get in with Intel before the launch.
The products that Hynix has validated include 1GB and 2GB modules at 800MHz and 1066MHz speeds, with Cas7 timings. Expect these to be the standard speeds for DDR3 modules, with enthusiast grade stuff coming in a little faster.
The memory standard is set for another slow ramp-up, as we saw with the DDR to DDR2 transition. Initially, memory performance will likely be little faster than DDR2, if not a little slower, but speeds will ramp up over the next couple of years until it's time to start thinking about DDR4 again.
Intel won't face quite the same opposition with DDR3 as it did with DDR2, since its strategy has already been vindicated once. µ