In case you were wondering when and where all was to be revealed about Windows 8, the answers "now" and "here," respectively. You can—and should—tune in live to Microsoft's Build conference keynote here: [Build]
For some reason, seeing a keynote presenter for MS in casual clothing and sneakers just comes off as totally phony to me. MS, in my mind, is a company for business. They should stick with what's they're known for instead of muddling it up and confusing people.