Sorry for the noise. I just read this and haven't really analized it. It looks like more of the same trend of locking down the software users can use by checking signatures in the boot loader. What I haven't researched is whether that will imply also that firmware needs to be signed, where will the truststores be (so who will control what software can run) or whether "secure" hardware will be very popular in the market or just a failed attempt at seizing power, or whether this will divide options into only two : open hardware with free software or closed hardware with propietary preapproved telecontrolled software.
Heise: Windows 8 to include secure boot using UEFI 2.3.1 http://www.h-online.com/security/news/item/Windows-8-to-include-secure-boot-... (I think there's a German version too)