https://www.guru3d.com/ne...16gb)-memory-kits.html
 
G.SKILL International Enterprise Co., Ltd., the world's leading manufacturer of extreme performance memory and gaming peripherals, is excited to announce two world-class extreme speed high capacity memory kits - DDR4-4266 64GB (8x8GB) and DDR4-4000 128GB (8x16GB) for the latest Intel Core X-series processors and X299 motherboards. Both of these new memory kits support the latest Intel XMP 2.0 for an easy one-step memory overclocking experience, and will be available at authorized G.SKILL distribution partners in 2019 Q1. I didn't see any info about whether these kits have RGB or not. Price wasn't available but I'm sure they won't be cheap.
 
EDIT: The GSKILL website says these kits will be available in Q1 of 2019.