If you really think about it, it would make sense for Blizzard to move away from the Claw Pack concept when moving the class over to WoW. The Claw Pack was mainly there to make the diminutive Goblin hero more visible on a RTS map. Since that isn't an issue in a MMO, moving to a mech-based Tinker makes more sense. Further, the Tinker hero's ultimate ability was riding a mech, so even going that route doesn't completely alienate the concept from its roots.
Also this;
Looks better than this;
I agree.I made a post in this thread about that topic. All of the other potential classes only really fit in a very specific theme. If the expansion isn't the Dragon Isles, for example, then Dragonsworn doesn't make a lot of sense.
But Tinkers can literally fit any expansion theme because they're not really polarized to any real extreme.