Why? Look, Slate PC's are nothing new. The industry's wandered off into heavy tablet PC's, sure, but my old Fujitsu Stylistic (RIP) was a darn nice device. If they're being reintroduced, great, but they should be no more expensive, at worse, than the tablet PC's of the same spec since they ditch the keyboard and often other portions (the Stylistic had no floppy or CD/DVD drive...) of the electronics.
I'm not amused by tech sites which treat them as the new hotness and get themselves lathered up about them.