Yes, many outfits do that. There may be many reasons for this strategy, and most of them have very short term effectiveness with rather quick expiration date. This strategy when used out of alignment with the new product introduction (NPI) process may soon become detrimental. Think how many RED One prospects had second thoughts based on Epic/Scarlet rumor mill, or went with another brand altogether to "bridge over." And how many competitors were given advance notice complete with feature shopping lists? On the other hand, many start-ups use rumors to heat up the segment when they want to affect upcoming investment or an imminent acquisition. There could be many reasons and, I hope (for their own sake) marketeers at RED know what they are doing...Actually, the problem, as I see it, is that these companies communicate TOO MUCH about their unreleased products!
If you look at just the 2 examples discussed here lately, both outfits are young entrants with low organizational maturity still operating the entrepreneurial style. Lack of experience with NPI, track record, low capitalization, lack of resources, high risks, weak sales/ customer support/ manufacturing channels are just a few common attributes. No wonder that marketing runs rampant at times (or most of the time).
Whatever the root cause of this strategy, prospects are encouraged to exercise their own judgement including seeking counsel from the community. This forum has vast collective experience, and I found that many won't mind sharing their opinion on just about anything.