I recently spoke with John Hardy of the John Hardy Company.
The John Hardy Co. Home
He confirmed there are 3 variations of his preamps that will be available for the 500 series lunchbox format.
They will be variations of his M-1, M-2, and Jensen Twin Servo 990. His Jensen Twin Servo 990 will be the first available.
I personally am very excited for these! I am not sure if this is the best place to post this information, but 2007 Lunchboxes seemed fitting. Enjoy fellow slutz. Cheers.