Did you ever get the whole OT situation cleared up Jira? I would hate for you to spend all this work planning the OT, only for the Mods to say "too bad, you don't get to do it."
In any case, I'm not particularly good at this sort of thing, but I will second what Piecake said, you really need to front-load the OT with all of the ways that GW2 is different from a traditional MMO.
There are going to be people popping in and skimming the OT just wondering what all the fuss is about GW2. They generally had no previous plans to play the game, but they just keep hearing about it and want to know why. Hell, I was one of those people before I stumbled upon your original GW2 topic. The OT should be designed to hook these people before they get bored and (falsely) determine that this is another generic fantasy MMO. Once they're hooked, then you can get into the detailed discussions about races, classes, lore, mechanics, what have you.
Also, it couldn't hurt to have an FAQ section at the end of the post (character limit permitting) so that when people pop into the thread just to ask "Is there any PVE in this game or is it all just PVP?" we can point them to the first post.
Edit-
I'm sure I'm not telling you anything you don't already know here. If your previous threads are any indication, you know what you are doing, and you just need to find a way to condense it to a reasonable length for the OT. I just wanted to emphasize how many people there are out there that really want to play GW2, and just don't know it yet. Its just a matter of keeping them reading long enough for the content to start to sink in.