I dont think he even tweeted Durango's spec will be better. Somebody said Orbis looks way better, he said "you have no idea" or something, IIRC. Combine that with his recent podcast comments (n which he attributed favoring Durango games to developers having had Durango dev kits longer), and I just dont think there's a ton there.
I like the idea of some secret Durango bump, but there are too many highly solid sources like bkilian and lherre who have said otherwise. And we also have time issues, it would seem too late to add CU's or anything. And with so much of Orbis rumors proving true, it's harder to imagine all the consistent Durango rumors being false.
I think the best hope for Durango power is that the ESRAM, used in clever ways, can really turbocharge the GPU's flops efficiency above and beyond normal GCN/GCN2.