This actually makes sense to me, although I've been skeptical about Canon's "need" to release a high megapixel full frame camera.
I'll go back to a prediction I make quite a while back – I can see Canon releasing a "5D HD" that offers a pixel density somewhere in the same neighborhood as the 7D (46 mp), perhaps a little less. Same body, same basic functionality (with a slower frame rate likely) just a new sensor and maybe a little faster processor.
It would give customers a choice, but keep their production costs down since many of the components could be shared by both bodies. Canon has seen the D800 sales figures, so they know that high megapixels aren't in huge demand, but they probably also know there is a small subset of customers that will pay a premium for more resolution. Give them what they want, but keep the production costs down.
Even in the face of this rumor which is contrary to some of your predictions, you're still falling back on them? The main thing I notice in this rumor, is that the "3D" will have 4k video capability. That is not "the same basic functionality" as a 5D3. This model is obviously intended to be upmarket from the 5D3. Slower frame rates for stills, no doubt...but it's going to be able to do a lot more video-wise.
I don`t think they will name it `3D`because its misleading... people will think that it can do 3D video...
Really? I know people in general are pretty stupid but THAT stupid?...
Well, think about it... how would you explain to a friend who doesn`t know anything about DSLRs?
Sample conversation (the conversation doesn't have to go this particular way... just hypothetically):
You: Yo Canon is releasing the 3D... or... did you check out the new Canon 3D?
Friend: What is a Canon 3D?
You: Well, its a DSLR camera that shoots both stills and video
Friend: Does it do 3D video?
You: Ummmm... no....
Friend: Then why call it 3D?
You: **Shrug** Internal conversation with your own self - I knew they shouldn't have called it the 3D... stupid... stupid... stupid...