As is mentioned in available documentation:
Windows Server 2012 R2
Microsoft Internet Information Services (IIS) Version 8.5YesNo
Both Microsoft .NET Framework 4.5 by default (includes ASP.NET 4.5) and Microsoft .NET Framework 3.5 (includes .NET 2.0 and 3.0) installed.
So, IIS 8.5 is supported by GA.