Amazon bought Liquavista from Samsung last March, so they've had the company for nearly a year now. I was just looking for news, and I came across some interesting job ads from Liquavista that were posted in the past month:
Operations Program Manager (Asia based)
Process Quality Engineer
Product Test Engineer
Process Development Engineer
Product Development Manager
and several others
It looks to me like Liquavista think that the basic R&D is done, and that now they are moving towards mass production for a mass market product.
I have no idea how long a ramp up to volume production takes. I suppose they might just manage it in time for a product launch this Autumn.
But I'd be very surprised if we didn't see a Kindle using a Liquavista electro-wetting display by the end of 2015.