I don't understand all the love you guys show for Bitmain. Yes, they have delivered. No, their price has been reasonable, but not good for us miners. Most likely, they are going to price S3 at over 1 BTC, I'd say around 1.6 BTC or so. Why would they undercut their S2 models by selling S3 at 1 BTC or lower? It makes no sense. Don't be a fanboi.
They are abandoning the S2 model.. that's why. Going to a new chip.
S2 was mistake. If you compare s1(how they were build) to s2 you can clearly see that s2 was just done in rush. They realise that it's not even near of s1 so they abandoned that. upgrade kit probably will be a new hashing cards with new chip.