Service Pack 1 for SharePoint 2013 has been released. This includes all previous bug fixes released in the CUs. It also enables the ability for folks to use Windows Server 2012 R2. In a previous post, I explained how to slipstream a service pack into a SharePoint build. Although the process does work for SP1 and SharePoint 2013, IT WILL PUT YOU IN AN UNSUPPORTED STATE. If you want to install SP2013 on Windows Server 2012 R2, you will have to wait for us to build the bits with SP1 included. Due to a package change in March 2013, slipstreaming work work. For more FAQs on Service pack 1, check out Stefan's blog.
UPDATE: The prebuilt package with SP1 has been released.
We were able to make a SP1 slipstream from the RTM ISO. Installation was successful. We are going to stress test it on a sandbox this week.
Steven, although you made a slipstream, you're likely missing important bits. The packaging model changed with the March 2013 CU, so what's in SP1 doesn't align with what's in RTM. Please use the prebuilt package.
YOU WILL BE IN AN UNSUPPORTED STATE WITH AN RTM + SP1 SLIPSTREAM BUILD!