Actually, Plastic Logic does not use E Ink Corporation products, they are a completely independent company.
I am of course cautious in my optimism, but I really need an A4 solution. At least believing that I will get my hands on it in a year or a bit more will surely have positive effect on my psyche.
As for the E Ink Corp., I would say that they have been quite honest about what they offer. You cannot blame them that not everyone who has purchased a product with their screen did not know about the slow refresh rate in advance. There are many reasons for that, such as the seller not putting the information in the product description, even a manufacturer of the particular device not doing that (do not know whether Sony did that), etc. There are many points where the information could be lost, if it really was lost, and it is probable that those not in knowledge of the fact did not do read much reviews on the device.