Sony won't win E3 as far as im concerned, neither will Microsoft and Nintendo. Will they have a good E3, a good presentation is the better question and I woul say yes. I like to be optimistic because I love games. Branded one side is a pathetic attempt to justify one's purchase to sleep better at night.
Anyway, logically speaking Sony will have games. They didn't have a lot of games at last year's E3 and I think for good reason. They didn't need them. They held back showing what they have in store because it was too early. They already had the momentum with Microsoft's PR disaster. Sony has more studios than Nintendo and Microsoft. They didn't show anything off from Sony Santa Monica, Quantum Dream, Media Molecule, Guerilla Games, and we still have a lot to learn about Uncharted, Order 1886, The Last Guardian, and potentially Project Beast being real. If Project Beast is real, than in "your" terms, Sony won E3 in my opinion.
