Luke has said that is all that is left to be done.
I know Ben you have been working hard on that and the serial interface tweaks so it will run well from a single USB cable.
After lengthy testing we now know that not all boards will run OK over the serial connection. There is a hardware issue that is causing communication errors on some boards when the serial connection is used. This is not an issue when the boards are used over USB.
And if a stack runs OK with the serial connection, the total hashrate will most likely not be higher than an USB connected stack.
I did manage to get up to 500GH/s for a 16 board tower, but only after replacing suboptimal boards.
That same stack went up to 507GH/s when connected over USB, but that might have been a matter of luck.
I am currently testing a stack that consists of boards that have been modified by hand.
Regarding Bfgminer, Luke is waiting on me for a version of the firmware that includes the number of chips in the answer that the board gives on the version question send by Bfgminer. I am not sure why, but it seems that the boards are not answering, or I am doing something wrong. I am still investigating.