The last I read was that the Echostar 24 satellite is to launch in early 2021. It will provide speeds up to 100Mbps and will have a capacity of more than 500Gbps, which is a good bit more than both the ES17 and ES19 combined. Part of it (50Gbps worth) will be supplying internet across Canada through Explorenet. It's likely that the rest will be for service on a widespread basis across the Americas, but I'm sure at least some of that capacity will be available to us.
Whether the service it will provide will be Gen6, I don't know.