Sorry CC and Salmon, thought I'd replied but have returned to post an update and realised I didn't. I know you can download the ISO, which I have, I have just been holding off to see if it eventually trickles down through Windows Update. Salmon's post above is useful for anyone who wants to be able to download the ISO easily though, I did that initially to do a clean install of Windows 10 rather than use the media creation tool.
My gf's laptop picked up the November update today after the normal Patch Tuesday updates, it's been downloading it for a while so it'll probably install tomorrow. Installed the same round of patches on my machine, rebooted and re-checked for updates, but still no TH2. It looks like that means it's still not available for everyone, which I see Computer_Commando has alluded to above, that MS may still not be making it available to everyone at once possibly to conserve bandwidth.
Just updating here as I thought someone may find this useful and/or reassuring, if they haven't got the TH2 update showing yet then it may just take a little more time.
Edit: though, I'm not sure what criteria they are using to determine which machines get the update. My gf's laptop was upgraded quite a while after I installed Windows 10 on my machine, and we use the same connection and the same IP so it doesn't seem like it's based on location or available bandwidth. My machine also runs 24/7 whereas hers is on for maybe 4 hours a day. Maybe it's semi random or MS are using some internal logic that isn't obvious to outsiders to determine which systems get the update before others.