According to this presentation the release of AdminStudio 2015 should be right around the corner.
AdminStudio 2015 to be Released in July with Application Compatibility Testing for Windows 10
Ive already played around with the new powershell functionality in InstallShield 2015 which gives access to the current Windows Installer Session and so far it seems pretty cool.
Source:
http://resources.flexerasoftware.com/web/pdf/Event-SS2015-Welcome-Trends-Update-Littleson.pdf
http://helpnet.installshield.com/installshield22helplib/helplibrary/CAPowerShell.htm