If they show anything new, I don't think it will be labeled as CV1. More than likely it will be something similar to Crystal Cove, which was an early look at what DK2 will become.
Yes and no. Yes, it's up to the devs to implement whatever input device they think will work best for their game. However, there are just so many different input devices out there that it is difficult for the devs to decide. Should a dev focus on ControlVR support, but then drastically reduce the size of the audience, or should they just implement gamepad support and lose out on the 1:1 mapping of their hands? What about Stem, PrioVR, M/KB, Hydra, etc etc?
Oculus is known to be working on their own input solution, and if they were able to have it ready by CV1, then it will give developers a really easy choice for what to implement as it will likely be the input device that a majority of the audience will own. Without an official input device, developers will likely fall back to gamepad's (which does work, but is far from a completely immersive experience) or choose from a variety of input devices, each with their own sub-user base within Rift owners.
I really wish I could go to their dev conference to listen to all of those amazing speakers. I'm glad they will be running live streams though.