Yeah - I think march is still going to happen.
I think their fear is showing NX's portability will somehow cannibalize the recent uptick 3DS sales. But by the same token they want the NX reveal to be fresh enough in people's minds and launch soon enough that they consider it an alternative to PS4/X1. This is why they're revealing it as late as possible.
Additionally, it's not that they're unable to reveal the NX - they just want to be very, very clear what the system is and what it does. They also need to make clear right away they haven't repeated the same mistakes as WiiU.
The WiiU by comparison largely grew stale in everyone's minds long before PS4/X1 even launched. The WiiU came out too early into the spotlight with a middling message. The NX instead will come at a time that feels late, but with an overwhelmingly clear and positive message.
I predict NX launches in 2017 - not 2016
