I sent off the newest version of the LegoShield PCB to BatchPCB this weekend, so We'll be getting the first few pieces back in a couple of weeks. At that point, I'll assemble them and see if any distributors are interested in taking part.
I decided to use the official NXT RJ12 (modified phone jack) for the NXT connections, so now you can either plug in a mindsensors multiplexer or plug the device in directly to the shield.
As before, the shield is compatible with the Xbee shield for double-stacking.
Also, there's a blueSMIRF port now, so you can use sparkfun's bluetooth module instead of xbee if you so choose...
Should be interesting!