Is waiting past E3 to reveal NX a good thing for Nintendo?
Appsolutely. It wouldnt be good move to reveal NX at E3 with all that other huge news like VR, PS4.5, new Xbox, other huge games...
IMO best way is to reveal NX sometime after E3 at separate event where they will have all attention and all time only for itself, same like PS/MS done with PS4/XB1.
Today there is no need to reveal your console (or any other technical device) year and half earlier before launch, you can revile just 6 months earlier make huge hype and great marketing that will lead to good launch.







