You asked about the bus, not the protocol or products, so I answered accordingly. Sorry.
The SRXL protocol we use for X-Plus channels also supports the 12 base channels at full 2048 resolution and speed/latency. There is not an X-Plus product at this time which breaks the channels out, but there is no technical reason why there couldn't be.
It sounds like you are asking now for a product which supports the full capabilities of the protocol. In that case I need to give the "sorry, I can neither confirm nor deny any potential new products or features" reply.
Andy