Microsoft has released preview 4 of its next version of Visual Studio that is Visual Studio 15 on 22 August 2016. You can see fill list of new feature on below link:
For downloading this preview version of Visual studio 15 you can use download option on below link:
But main problem most of the users experience is not offline installer available there. So we have a simple set of steps you can follow and download Offline Installer ISO of any version of visual studio.
You just have to download web installer exe from link given above and then follow steps described in two of our previous. Here are those articles:
Only difference in steps of these articles and your steps would that you have to use web installer exe download from above link instead of web installer file described in these articles.