Well, the rumour mills have been well and truly circulating recently about the potential for high capacity DRAM chips which could allow laptops to have up to 64GB of memory. I was recently directed to this article (https://www.anandtech.com/show/7742/im-intelligent-memory-to-release-16gb-unregistered-ddr3-modules) from the ArsTechnica forums.
This article basically describes a new method of DRAM stacking (as opposed to the standard method of NAND stacking) which allows the production of 16GB SODIMMs chips. My current laptop has four SODIMM slots (like pretty much every other high-end laptop on the market) so with the current maximum of 8GB SODIMMs my laptop supports 32GB RAM. If I could use 16GB SODIMMs then I could theoretically swap those chips out for a straight 4x 16GB SODIMMs (i.e. 64GB of RAM).
The best news is that these chips could be on the market this year!
“Mass production is set to begin in March and April, with initial pricing per 16GB module in the $320-$350 range for both DIMM and SO-DIMM, ECC being on the higher end of that range.” (source: Anandtech article linked above)