http://www.roughlydrafted.com/RD/Q4.06/922B4392-850C-4CA6-92...
Microsoft, in this example, tells you neither. The three items of information are "it's Windows 8.1", "it's a free update", and "we will tell you more" (that third one is counting liberally)
With Apple, this would either be a new OS X release that gets a page showing its new end user features, or it would be an update that simply showed up in System Update.
Stay classy Microsoft.
Google's done the same as well after Apple events such as them announcing they would drop h.264 for Chrome which never came to fruition.
Ironically, if that were the case, it wouldn't need an update.
Recently encountered an interesting article on topic—Sorry, PC Industry: You’ve Apparently Managed to Perfect the PC (http://techland.time.com/2013/04/11/sorry-pc-industry-youve-...)