I actually think that this is a great idea on the condition that PG/JL/TLB/RM still have the majority of the final say. Given the sheer volume of applications, having more eyes can really only help ensure that the most promising startups get the attention they deserve. It also sounds like a great way to pair up new founders with YC alumni who really see the potential in their startup. I know that my co-founder and I personally think that being stealth is overrated/stupid and would love to hear what other smart people think about our idea.
Disclosure appreciated.