In theory, and unless serious and urgent bugs are found to be solved, the Golden Master version is the final version of the system ready to be released. The build number is 11A511.
We don’t know anything new about this version yet, but being the Golden Master it’s assumed that Apple will have concentrated on fixing the bugs that appeared as a result of the developers’ feedback and on polishing the system so that it won’t have any problems during its launch on the Mac App Store sometime this month. On some occasions Apple has had to release a second version of the Golden Master, although it has been few.
Usually it takes a few weeks from the time Apple releases a Golden Master version of Mac OS until it is released in stores, but knowing that this time there is no need to physically distribute the system ( zero shipments, zero logistics, zero optical units ), it may take a little less time. Even so, the final release date of OS X Lion is still a mystery (although some rumors talk about July 19th, along with some new computers).