1. I'm pretty sure. I think I might have wondered this myself when I had v5. If the download is from the first post on this thread, then yes, it is version 5. Sorry for the mixup there.
2. Goblins: As for v5, no. v6 (coming to public soon) is a little better, when I played through, I was unable to leave the island. However, v6.1, which is the current VIP version, you are able to get off the island, and the quest line should be mostly intact. I am not a developer of the repack, so I can't tell you a % or what is fully developed, but v6.1 was all about the goblins starting area.
Worgen: For v5, I'm unsure of the state of the starting area/quest line, as I did not create worgen in that version. In v6, I think I had to .cheat complete a couple of quests, and I used .mod speed in order to get to some areas since the wagon/vehicle parts aren't scripted yet.
Hopefully I answered your questions properly?