So, when people see the Gen 5 in a few days Gen 4 prices will crash? If the Gen 5 was available to buy in a few days and there was no wait, I would say that there would be quite a few people trading their Gen 4's for the Gen 5. This would cause an increase in the number of Gen 4s on the market, but to hypothesize that there would not be enough Gen 4 buyers to purchase the newly available Gen 4s is pure speculation--in other words it may affect prices and may not.
However, the major problem with the original statement is that there are ZERO Gen 5s available and they will trickle out of the plant much later than 5 days from the priginal post. Just the mere "seeing" of the Gen 5 should not affect the price of the Gen 4 at this time. The Gen 4s will depreciate, yes, but since supply and demand will not be affected at this time the whole idea is without merit.