As someone who was with the Xbox from the beginning, but jumped ship for the PS4, I actually sat and thought about the OP for a little bit. And the truth is, from my perspective, they simply can't. Microsoft are still feeling the pain of the reveal, the DRM, and the solid year of terrible PR. Even if Microsoft pulled off their greatest E3 ever, all it would do is essentially wipe that away and give them a clean slate to start from.
To achieve their best "E3 Ever" they'd need:
- Kinect's Killer App.
- Keep Kinect and drop the price by US$150.00
- Several new IPs that all look amazing.
- Remove the media features from behind the XBLG pay-wall
- An amazing Halo 5 demo
- Banjo-Kazooie 3
- An on-stage apology for the attempted DRM
And I don't believe we're going to get a single one of those. I suspect Microsoft's big guns will be the Halo 2 remake, Sunset Overdrive and Quantum Break. And a teaser for Halo 5. No price drop. No Kinect removal. But maybe three months of XBLG in the box instead.