Hi Kevin
I don't know how they plan to release products. Ideally if they produce 21, 9, 8 and 6 pin Bluetooth decoders of the same size as current DCC decoders, they could be swapped or used instead of DCC decoders and could therefore operated on existing DCC layouts and with DCC ready locos. This would allow overlap of deployment over the first decade without modellers forced into a big spend change over.
I assume the power supply from the decoder to the loco motor would be the same as DCC, but the messaging protocol and configuration of bluetooth decoders would be quite different and very user friendly (i.e. there would be no concept of low level techie stuff like CVs, test tracks, programming, etc, all to be buried behind human friendly interfaces smartphone app style).
However if this ever gets traction, I suspect there will still be a market for wireless cabs with physical controls, not just touch screen devices. Tablets and smartphones great for additional cabs and setup, but for train driving most need the tactile feel for blind one handed control.
Noel