Yes, he's restoring various things, but he may not have used the SE as his source, I think he had a better source. His goal is a restoration without the SE changes, if I recall correctly. And his new source, well, it looks just awesome...

And yes, he never said he would publicly release it when he was done, because of the trouble it would cause. But has released methods in the past. The problem is that we don't have access to the kind of sources he does (and that's an understatement). :)