IE9 to IE10 was aggressively launched as well. I believe users got a basic prompt and IE turned on auto-updating by default. According to some of my users, IE10 just appeared, so my guess is that MS may have the prompt time-out to 'yes' instead of infinitely holding the computer.
Here in corporitstan, I had to put in extra blocks to keep 10 and 11 away, due to our CRM being suck on IE9 for the time being. Trust me, MS is trying real hard to get everyone to the newest version of IE.