It looks nice in theory, but one thing I noticed was in the promo video, how long it took to type "Must be sure to get there early," or whatever the sentence was. I typed out the same sentence on my iPhone and did it way faster.
Considering this is a promotional vid, you'd think they make it appear fast and efficient. The whole idea of preditive text IS to be able to type quickly... quicker than pecking out the whole word on a keyboard, anyway.