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Starting with the Beta build 18764 of Warlords of Draenor, the version changed from 6.0.1 to 6.0.2 for reasons unrevealed. Starting with PTR build 18838, the public test client also shares the same version, adding to the confusion. This expansion breaks the previous versioning traditions, so the live, release version of the expansion is likely to be 6.0.3 or higher.
As of September 17, the Beta and PTR share the same build number 18888. On October 12, both the Beta and PTR went to build 19027 as the first Warlords of Draenor pre-patch which did not appear on Live until 2 days later on October 14. Soon after, a hotfix build 19034 appeared on Live, but not on the Beta or PTR. On October 20, 2014, the builds diverged as build 19041 appeared on the Beta and PTR, but never made it to the Live servers. This could have indicated the difference between the pre-patch and the expansion patch are a server side switch, but as of Beta build 19057 (October 22, 2014), the version switched to 6.0.3.
Official Patch Notes
- Official Beta/Release Patch Notes