On my X220 the Windows 7 boot is already fast even without a SSD (pre-desktop authentication and some Lenovo sauce helps) but watching the video FTA - that's mind bogglingly fast - it's more like the Mac's sleep/resume than a cold boot!
The key change seems to be a clever kernel session hibernation. They discard user sessions as those involve writing a lot of data (full hibernation) but save kernel session which can be written out and read back fairly quickly. Then there is multicore enabled resume - doesn't help with disk io but with decompression of hibernated data.
Multicore does nothing for raw io rate, but they're using compression, and the claim seems to be that they can use higher compression levels and still be faster than an SSD (so that decompression throughput won't be a bottleneck).
If hibernation didn't use compression, there was no need for CPU involvement due to DMA. Since there would be no CPU involvement, being multi-core enabled wouldn't be of help.
The key change seems to be a clever kernel session hibernation. They discard user sessions as those involve writing a lot of data (full hibernation) but save kernel session which can be written out and read back fairly quickly. Then there is multicore enabled resume - doesn't help with disk io but with decompression of hibernated data.