The computerized version is available just like the DAT--basically any day you want, with the exception of certain holidays.
Literally, you could take it in March if you wanted, or August, or whenever.
The ADA told me that registration for it would be available online (at the ADA.org website) sometime this week. More than that I don't know.
I'm leaning towards taking it on computer (if my Dean will allow it), simply because I'll have a couple more weeks to study for it.
But the BEST reason to take the computerized version is that you get your scores in 2-3 weeks. The paper version (on July 12) takers will get their scores in 6-8 weeks.