I had been thinking about doing something akin to the X16 but more modern, but realised that the main challenge with launching a product like this lies not in doing the design, but in coordinating all the people that are involved in producing the hardware, software and documentation (and hype, don't forget hype). And you've gotta hand it to David Murray (the 8-bit guy): he's knows how to do this, and has demonstrated this before with Planet X3.