An AMD exec hinted (last month) that Windows 10 RTM will be available sometime in July. And today popular trustworthy Microsoft tipster @WZor tweeted and confirmed that indeed the RTM build of Windows 10 will be ready and available in mid-july.
What is RTM? It means "Release To Manufacturers" build and it is the final polished version of Windows 10 that Microsoft sends out to Manufacturers to tweak, customize and use on their hardware.
RTMs are very very similar to the final product, the only difference being that it doesn't have bloatware from these manufacturers.
And another added benefit is that once the RTM is released, it is almost instantly available for download online as an ISO image.
If you are running Windows 10 Insider Preview, then you know that Microsoft has been releasing newer builds at a faster pace and with each build released, the experience is getting better and better. This is because as we draw nearer to the RTM release, Microsoft is polishing up the Windows 10 OS.