Injecting virtual texturing, into the current rendering pipeline, sounds like a fairly large undertaking and therefore I’d assume it won’t be finished any earlier than 4.19 or 4.20. Who knows though, it may make it into 4.18. As far as I know, they try to release an update every quarter, so 4.17 should be Q3, 4.18: Q4, 4.19: Q1 2018, etc etc.