No SpeedStep, only 2-step BIOS option :(
Another inaccuracy in the article: The Celeron ULV processor used in the 701 & the 900 doesn't have, for reasons better known to Intel, any SpeedStep capability.
The 701 has an on-board ASIC which reduces the FSB down to 66MHz (although various hacks have been produced to restore this to 100MHz, but reportedly this was somewhat fragile and raising the speed straight to 100MHz could lead to system-freezes. Stepping up to 100MHz worked better, but the consensus seems to be that 80-90MHz is more stable) whereas the 900 now has a BIOS option to choose 600MHz (66MHz FSB) or 900MHz (100MHz FSB) - but still no way to change this whilst the machine is running.
Real power-management is probably the greatest benefit that the Atom version will bring... it certainly won't be performance: despite its advanced features (AMD64 instructions, SSE4, etc.) a 1.6GHz Atom is thoroughly trounced in benchmarks by the very 900MHz Celeron that the eee currently uses!