I've been a bit out of the loop lately and not up to date on all the drama between manufactures and such. That said, in reply mostly to Landsteiner's comment, I suppose, from a technological stand point, there is no real difference between Wifi and Bluetooth. they both work in the same way on the same radio band and have equal reliability, bandwidth, and error correction for all practical purposes.
For the purpose of specifically controlling model trains or an entire layout, both systems have benefits and drawbacks as currently implemented. Bluetooth's biggest problem is that, by design, it is a point to point communication. it is intended for one device to talk with one other device. With the current generation of affordable bluetooth BLE transceivers, it's possible to have one master talk to 6-10 slave devices by rapidly opening and closing connections to each in a round robin, such as the way the Universal remote works, but it is not a practical system to control the countless devices found on an entire layout.
As I understand it, MTH's Wifi system still only acts as a bridge between DCS and a wifi enabled device, so it doesn't actually offer any functional difference over what DCS can do. That said, if a system was created where engines and accessories communicated directly over Wifi this would work quite well to control an entire layout. The shortcoming of this setup would be that the 'base station' would need to be fairly powerful compared to the electronics used in this hobby up to this point. A computer from 10 years ago would be more than enough, but even that level of tech and programing is far beyond what we typically see in the hobby. Direct Wifi communication is great for hobby level setups, but is not great for a commercial product as there are countless other radio standards for mesh networks that are cheaper and easier to use in a commercial setting.
Over all, Wifi and Bluetooth are pretty much the same thing, a radio that can do one can be reprogramed to do the other. Either one is better than sending data through the track, but as far as I'm aware, only Lionel's bluetooth implementation actually does this.
