Well the new Windows 10 OS Consumer Preview will be available January 21 2015. Anyone interested in it should check it out.
There are great articles regarding Windows 10 at Paul Thurrott’s SuperSite
Windows 10 will be what Windows 8 should have been. People got pushed into Windows 8 new “Metro Interface” that no one likes. I use Windows 8.1 at home and I use Classic Shell to bring back the menu. Anyone who is on Windows 8 I recommend this if you don’t like how 8/8.1 looks right out of the box. What does Windows 10 do? It brings back the old style menu along with Windows 8 apps in the menu. Makes it much more friendly for people who are familiar with how Windows has been over the last 15 years.
When will Windows 10 be available? MS has not announced it yet but I suspect late summer or the normal October release of MS OS.