Well, I was wondering if it would be a good idea making a "rumors/info" page for the wiki, with all the sketchy info about the game and future updates which we have gotten from talking with devs or similar. Other miscellaneous info which can't be found easily is also welcome.
Dunno if it's really wiki material. I don't have much, but it's probably because I keep forgetting:
Rumors:
Vogs will eventually come back, probably in boss form.
Source: I asked Boswick why fire alpha wolvers weren't using the Vog texture, and he said they are saving it for something else. Also the fact that there are "Vog" items in the game, so they have to come back eventually.
Confirmed/quotes:
Vanaduke quest thing or similar:
Nick: "You mean like the sprites you'll have to rescue from Vanaduke's fiery prison? Oh my!"
Source: http://forums.spiralknights.com/en/node/1955#comment-11642
In Puzzle Pirates, we did have an article called "The List" (http://yppedia.puzzlepirates.com/The_List), but even those confirmations were not always right because of shifting priorities and whatnot. It was also rather a bear to organize/keep updated.
Already in the rumor you're mentioning, I see that you've embellished by adding "probably in boss form" without mention of Boswick saying it would be a boss. I don't even know that I would consider Nick's comment about sprites that you mentioned to be official confirmation of anything. It looks like it's possible that he was joking.
So while you could create a page if you had links to the specific posts, I honestly don't know how useful it would be. Really highlighting things like that could possibly make devs more shy to mention things if players get all riled up when things don't happen when they think it should/would because of having such a list.
Those are just my thoughts though, I won't delete it if you would still like to create it and keep it updated. I'd definitely slap a big warning on the page about how none of it may be true though.