OSX Mavericks - Golden Master vs. Retail

Hey guys,

Quick question! Is the Golden Master the same as the Mavericks release on the App Store right now? I'm on GM right now, and I see Mavericks as an available Free update on the App Store. If I try and get it though it tells me that I'm already on 10.9.

Can somebody go to About This Mac and under More Info tell me the build number for their Mavericks installation?

Moreover, will the GM follow the same upgrade path as the retail version or is it a dead-end branch? Thanks in advance.