It is not a secret that Samsung has been working on A-die memory ICs, after ending the B-die series, however, they've already been spotted. The DRAMeXchange is already expecting prices to drop further this year, in 2019, as a result of the trade war between China and the United States. 

Now Samsung seems to be planning to put ddr4 chips in consumer DIMMs based on its 10nm process. Germany based Hardwareluxx that spotted a memory kit called M378A4G43AB2-CVF, and specifically that kit has been fitted with new A-die chips from Samsung. As mentioned, Samsung B-die is no longer fabbed, and will slowly get replaced by A-dies, based on a smaller fabrication process (10nm which got announced in 2017) more chips will fit on one wafer, and that means less production cost and (hopefully) better prices.

Sour grapes
What is interesting though is that the two modules have a capacity of 32 GB, eight chips per module. It seems though that one disadvantage of this process is that (currently) the clock speed this time drops due to the properties of the materials used in such a small process. This specific kit, for example, reaches 2933 MHz, nothing special and nothing terrible either, but what is noticeable it that the kit has incredibly bad timings, at CL21-21-21. That certainly needs to improve to CL17 or CL16 at the very least.

Samsung A-Die-DRAM spotted, might make DDR4 even cheaper