That's fair enough, at this point it's largely guesswork. ("Mark my words" comes across as a lot more (over-, in this case) confident than an estimate.)
I bounce around between thinking they're going to smack the competition with a ~3500 price tag...or price it somewhere on the moon. As for the R6, I don't care. Unless it's ridiculously cheap, I'd prefer an RP over that low-res sensor. (But I really want an R5 if it's not ridiculously priced.)
I base my estimate on many things....mainly the fact that the RF lenses aren't cheaper than their EF equivalents, there are already 3 camera bodies in that price range if not more (Sony A9II $4500, S1H $4,000, and the Panasonic S1 with similar specs to the R6 is $2500), it is a shrinking market so fewer customers mean remaining customers pay more, there will be high demand after customers waited so long (high demand means higher price at least initially), if you look at inflation and exchange rates $4,000 in today's USD is around $3300 in 2015's USD, the list goes on.
Also, Canon during their NAB conference mentioned the 5D debuted below $4,000. $3999 is still below $4000. For the people that say Canon can afford to release these bodies way cheaper just to make a statement....you need to look no farther than their RF glass prices to see Canon needs to get back their R&D; making a statement is for non profits.
I wonder why do they release the new C300 and it’s only have 4K 120 in super 35 and looks like the R5 has way better spec. It make me wonder how much limitations R5 will have.
You are getting hung up on specs instead of looking at the big picture. The C300 is a real Cinema camera meaning unlimited recording, ND filters, XLR inputs, amazing new dual gain 16 stop DR sensor, 3 cards slots VFR up to 180fps, Cinema body form factor, DPAF in a cinema body, Cinema RAW light, 4:2:2: 10 bit LongGOP, 4 channel audio recording...need I continue. That camera is far more than the sum of its parts and no production studio making a feature film would consider the R5 as anything more than a crash cam.
Also, lets not forget we still don't know everything about the R5; recording limits, will it record video to both cards at lower resolutions, will Canon release an XLR module for it, will it overheat on hot days at the higher frame rates, what are the compression modes for the resolutions below RAW, etc, etc. If I was shooting a major production the R5 wouldn't even be on my consideration list.