From my understanding, Microsoft has realized that Windows 8 brand is dead. They tried 8.1, didn't work. Update even less. And just like Vista Brand it never recovered from the early media and user bash.
I can see them releasing an Update 2 in 2 or 3 moths from now, with just some cumulative bug fixes and maybe a feature or two. But Windows 8.2? No, they are aiming for Windows 9 to revitalize the branding, just like Windows 7 did.
Windows 9 by the this time next year should be RTM or very close, there's no time and will for other small releases.
Heck we should be seeing Windows 9 beta even by the end of the year.
This is just my opinion