WCDMA
ev-do is the cdma comparison to wcdma. just wcdma has a few minor advatages such as being able to do voice and data at the same time.
(correct me if im wrong)
i believe they are plotting another revision of ev-do called revision A or O.(don't quote me). thats why ev-do isn't spreading to every market so fast. they don't want to roll out the first revision everywhere and then have to do the same with they next revision. but ev-do is data only.
and ev-dv is data and voice. that maybe what your referring to. i wonder if you'll have to get a newer lg8100 or vcast ev-d....phone to keep up with the technology or if its ota updateable.