The Windows 8 Pro one with Core i5 Ivy Bridge processor that will arrive later on in the year, but in time for the holiday shopping craze, is expected to be north of $799. It is not specified whether these prices will include the Covers with keyboard and trackpad, or they are just for the slates themselves.
Microsoft has made Surface a compelling enough offering, so it can afford to price them a bit higher, but this should be exercised with caution. Considering that $450 these days buys you an Acer Iconia Tab A700 with Full HD screen, it might have to slash the introductory prices, if that's what they end up to be, pretty quickly after the early adopters have gotten their Windows fix. Alternatively, some analysts say Microsoft might be pricing the Surface a bit higher to ease the discontent that could arise from its hardware partners, which might feel a bit betrayed by the announcement.