If 100M is enough for you, I'm developing a new board with 2 RJ45 for industrial ethernet, which has a 40 pin connector compatible to that of RPi B+, but the circuit is adapted from beaglebone black. It's scheduled for end of January 2015.
https://docs.google.com/document/d/1X9RrbkUpiTQ-S6Acken-5fv7...