No it is not 3G capable. When comparing GPRS/EDGE 3G to EVDO, you are talking apples and oranges.
My old 8703e could do EVDO...but not EVDO Rev A ( I don't know if that is technically 3G, but it's 1.5 mbps). The new Sprint 8830s, I think, are EVDO Rev. A, capable.
I switched to T-M0 to get the 8320 because my wife has t-mo and I wanted to mobile to mobile minutes...I truly miss the speed of EVDO ...especially with the new 8330s coming out!