Open source microcontroller TCP/IP? I give the Makers 6 months, the manufacturers 2 years, and the general public adoption 3.
Welcome to the future. Once again. It still blows my mind all the futuristic technology we have already. Here's yet another key to leapfrogging us ahead again.
This has been around for a while. Adam Dunkels used it for a C64 based web server. The other day I was looking at the Ettus hardware that is used with GNU radio. That has an FPGA that implements a microblaze soft-CPU and that runs this stack for communication over 1G Ethernet.
Now more commonly seen in Contiki:
http://www.sics.se/contiki/
which is an operating system for resource-constrained platforms ranging from 16-bit 10kB RAM sensor motes to C64s. It's quite an interesting project.