It's actually quite impressive that google would open up this much of their secret sauce, a lot can be gleaned from looking at this board. You can bet that this is not exactly revision one (and you can bet as well that this is likely not their latest and greatest, no need to show off more than you have to, competitive edges are pretty thin).
When I see stuff like this it is painfully clear that from a technological perspective a company like duck-duck-go has a huge amount of defensible moat to cross before they can begin to be a serious contender. Think about it for a second: the company that you're trying to compete with is operating at such economies of scale that it can afford to have its own custom motherboards + non-standard expansion boards made.
