Blizzard Have just announced the good news .. the pre-expansion patch is coming 14th October. Hurrah!
Just to make that good news all melt away into the Maw ... because the announced date for Shadowlands launch is no more. Currently there is no definite date - hopefully still this year, but the end of October launch is now not going to happen.
You can view the full announcement here: https://worldofwarcraft.com/en-gb/news/23536678/an-update-on-shadowlands
Time to grind those reps again: https://www.wowhead.com/news=318297/impressive-influence-100-reputation-buff-continues-through-october