After using both the Flex (intelligent) units and plus IIs (dumb) units PW will ALWAYS have two separate products the cheaper "dumb" trigger for manual use and the more expensive "intelligent" unit for TTL and high speed sync. The other big name in mainstream is Radio Poppers. They have the exact same story, cheaper dumb triggers and more expensive intelligent units.
I have 2 of the Plus iiis on order and am itching to get them in. I'll probably drop for another 2 once they actually are in the market or if I can land on some cheap plus iis. If you need high speed sync get a flex or mini on the camera and a plus for the flash. Read here
PocketWizard® - HyperSync
The plus III offers EXACTLY what it should, a slimmer design, built in antenna, group control, USB firmware upgrade (plus power through USB), and high speed camera trigger.