Is the stand removable?
Is the base/stand/foot removable like in older model iMacs? Is a vesa mount possible without direct order from apple?
Sorry, you'll want to get the VESA mount model.
So far none of the 'Thin Series' offer a user removable foot. The iMac Pro slideware at WWDC implied it will offer a removable foot. But we'll need to wait to see if it ends up being true.