I'm of the opinion that the CV1 won't be 1440p+ due to the computing requirements to be able to do side by side 3D at 60fps+ at 1440p+.
If the rift requires the highest end GPUs to run then they limit their potential market massively. You would expect that they'd want to sell to as many people as possible so I assume that they'd target mid range systems as the required hardware to run a rift decently.
Since the Facebook buyout this has opened a lot of doors that were previously shut to Oculus and as they said they were just getting the scraps from the mobile phone table. With the new financial clout they will be able to get custom hardware so the resolution could be custom too
Don't know if anyone's posted this before but here's a simulation of what the various resolutions of the Rift could look like
http://vr.mkeblx.net/oculus-sim/
The DK2 will probably look a little different to the one on there though as it has a pentile arrangement of pixels rather than standard LCD RGB square layout.
Going off this simulator 4K looks awesome but we won't have the GPU grunt to do SBS 3D 4K at 60fps+ for a few years at least.