Grabbed from Godox’s Facebook Page header, here is the summary how the company’s X flash system looks like nowadays.
Honestly it is quite impressive. There is a huge amount of speedlights, battery powered strobes and classic studio strobes as well. All the flashes, strobes and triggers are compatible with each other, moreover they are compatible with most of the camera brands, only the trigger has to be brand-specific.
It makes easy to switch between camera systems, which is quite an actual question in these days when new fullframe mirrorless cameras are coming and the market is changing.