Yes. We're intent on getting the 4.3 Public Test Realms up potentially within the next week. :)
As you mentioned, there's still a lot of work to be done on this patch, so a lot of the content will be rolled onto the test realms over time. Transmogrification, Void Storage, some balance changes, and several UI updates/improvements will likely make the PTR right away. The dungeon/raid content, legendary questline, Dungeon Finder updates, and especially Raid Finder are still very much works in-progress.