I spoke to one of the Topps-affiliated people at the show yesterday and the conversation drifted to sketches and I said something like "it must be hard to fill demand, Topps is putting them in everything", the response I got was that this person was at a Topps meeting to discuss "something new" that Topps wants to do with sketches. I didn't push since they said they were probably not supposed to be talking about it all. Speculation can now run wild
My guess would be that they will push what they did with the ANS 10 collector boxes to the logical extreme, putting sketches only in limited, higher end product. That's just a guess, but it might mean less, but higher quality, sketches.