Are there any photos or layouts of the upgrade kits for the S1/S2, is it true the S2 could be upgraded to do 2Th/s?
That's the theory right now, but nothing has been released, AFAIK, other than the drawing in the OP.
From the sounds of it, Bitmain currently has a focus on "ONE" product the S3
The S2 thread header was changed to "Last Batch" so it sounds like they will be dropping that development . Its hard to say what Bitmain is up to, they do not have clear communication to their buyers, They pushed back their shipping date of the S2's after people ordered .. Great product but poor execution on informing their customers ..