Comcast will be launching its own wireless service as part of an MVNO partnership deal with Verizon next year, and although Comcast should probably have launched this in mid-2015, the MSO has just avoided missing the boat as the launch is certain to shake up the US cellular market dramatically. Verizon will charge Comcast for usage of its cellular network, but Comcast’s crown jewels are its 15 million WiFi hotspots across the country – so if it can ship off around 70% of data usage onto WiFi networks, which will cost it basically nothing. The major advantage here is that operators will see less churn because consumers use less data thanks to automatically connecting to WiFi everywhere. So far Comcast…