Same as how ArcPad works: Plug the device into a computer via USB, provision base maps and data via USB, and sync Adds/Updates/Deletes collected on the Collector Device back to host databases via USB.
Given the quantity of comments on Geonet about displeasure with performance with wifi syncing, especially with photo collection, and the number of current ArcPad users that will not be able to convert to a "works with wireless only" product once ArcPad is retired in a few years, I find it shockingly surprising that Esri is taking mobile applications in the must-have-wireless connection direction, especially considering where most mobile data collection occurs: remote environments where back-offices have no wifi.