VM Ware was much worse when it came to updates. They're already trailing that a new version will be needed for El Capitan
VMware says Fusion 7 already runs El Capitan today, but it’s not considered a ‘supported’ version. This seems to be the case: I'm running it under the El Capitan Public Beta and it seems to work. Not that I'm doing anything terribly stressful to it. I suppose that, if I were, and if it broke, I would not be able to get support. (In particular, I've not tried Windows 10 on it: Windows 7 is fine for what I want.)
Turning things upside down, VMware Fusion 7 on OS X Yosemite supports El Capitan VMs — although, again, I have not tried doing anything too ambitious from inside one.