I'm not sure if he'll necessarily get back to you, because he's not on these MBs super often. If he doesn't, I'll say this - the guy has been around for a long time, is an incredible expert on the inner workings of TLG, and is familiar with constraction. That said, he has explicitly mentioned that he doesn't know either way for certain, and that's not a foregone conclusion - Sci often knows what's coming, so to speak.
To be honest, as much as I'd like to be excited behind the idea of a brand new standalone constraction theme, I think that it's been made pretty clear that it's really too unclear for any of us to say - and that includes Sci and pretty much all of the best known "leakers" as well.
And see, I don't want you to feel like you're not able to ask or get excited, but Payinku is right - you'd really be better off is you assumed that this is fake as a sort of "contingency", for the time being. Expect the worst, and hope for the best.