The pictured board has a 427, but the 429 has an LCD controller. With 2MB flash, 256K RAM, LCD controller, running at 180 MHz in a LQFP100 for $12, it seems compelling, when it actually becomes available.
Being short on S sockets is ironic, given that SPI is a bus, and is designed to handle multiple devices on the bus. This is one of the biggest (IMO) shortcomings of Gadgeteer, that in general, a LOT of pins are wasted in any given socket.
My existing maninboards are sufficient for protoripe devrlopment. But something I would like is a neat looking enclosue with built in main board, touch screen dispkay, rechargable battery, regulater and USB port to the outside world. But still maintain the ability to tinker inside the box to add specific modules etc. In other words a nice shrink wrapped product that just require software to become a sellable product. All I want to have to do is stick a label on the outside to make it a customized solution. If something like that would be avalaible it would allow someone like me to turn my hobby projects into a commercial product without expensive tooling as assocoated difficulties.