This looks mostly okay. Few notes though:
- I believe there is a way to confirm that a Miiverse post was made from a game, or was at least made by someone who has played the game. If there is, we can use such posts as sources, as we know they cannot be faked.
- If something has a whole ton of different single images from different sources, while none of the images themselves are proof enough, the sheer volume of them may be. For example say that after release we see about fifty different images of some new character, all in different poses on different stages. That's far harder to fake than a few images all on the same stage.
- The current standards are "SSB4-3DS" and "SSB4-Wii U" (fuller names) for categories, and "SSB4-3" and "SSB4-U" (single chars) for images/templates. I'm not sure which combo is better for articles:
- "-3DS" and "-Wii U" are the full system names, but the lowercase in the latter is unusual.
- "-3" and "-U" is short and distinct, but a lot of people will probably find "SSB4-3" in titles confusing.
- "-3DS" and "-U" is simple and convenient, but the mix of "full" and "one letter" doesn't feel right.
Toomai Glittershine 
The Undirigible 11:39, 27 June 2014 (EDT)
How about "SSB3D" and Smash 3D for abbreviating the 3DS version since several 3DS titles say "3D" as opposed to "3DS" i.e. Star Fox 64 3D and Ocarina of Time 3D? ZeldaStarfoxfan2164 (talk) is a never lover boy 12:07, 27 June 2014 (EDT)
I agree that an exhaustive set of images might be legitimate, but it's harder to come up with an objective criterion for what would be considered "enough" for legitimacy. As for the abbreviations, my personal preference is for SSBU and SSB3DS in article titles and potentially in-article text, but I understand that my opinions on this aren't necessarily the consensus. I prefer not to use "Smash ___" as an abbrevation if possible, even if it means using SSB___ instead. Miles (talk) 12:18, 27 June 2014 (EDT)
- Eh. I like SSB3D better, however, I am fine with both.
- On a different note, I'm thinking that we should provide short blocks after 2 speculatory edits, and a longer block after persisting speculatory edits.Qwerty the lord Please click "lord"
15:57, 27 June 2014 (EDT)
- During SSB4 early coverage, I mean.Qwerty the lord Please click "lord" 17:54, 27 June 2014 (EDT)
- Unless that becomes an overwhelming problem, I think we can handle it on a case by case basis. Miles (talk) 18:17, 27 June 2014 (EDT)
- If you're comparing SSB3D and Smash 3D, SSB3D is used in article titles whereas Smash 3D is used when mentioning the 3DS version in article bodies. ZeldaStarfoxfan2164 (talk) is bad for me 18:39, 27 June 2014 (EDT)
I've made some minor revisions; still accepting feedback for a bit longer before I try and put this into place. Miles (talk) 07:32, 29 June 2014 (EDT)
- I'm not sure why you removed the "SSB4-U" and "SSB4-3DS" abbreviation options. If we're going to have "SSB4" in titles, which is a given, it makes no sense at all to leave out the "4" in the version-specific title options. (And then the hyphen is required, since "SSB43" etc is very poor.)
- Actually, now that I think about it, this only matters at all for things like images and templates - it's not possible to have an article title like "Subject (SSB4-U)" or similar, because it'll be at "Subject (SSB4)", which covers its apperance in both versions. I cannot fathom how one subject would be so different between versions that it would need a separately-titled page like this. Toomai Glittershine The Aurum 09:58, 29 June 2014 (EDT)
I support all the things on the userpage at the time of this post. ♡FirstaLasto♥ 02:52, 30 June 2014 (EDT)
I too support this policy in its current form. The Miiverse policy will allow only people who're actually playing the game to contribute screenshots. 
intendrone42 13:46, 30 June 2014 (EDT)
Question about the JP release
I wasn't around to know how the wiki handled Brawl's JP launch, so how would we handle things like menu options and move names that are only in Japanese? Would we roughly translate them and use them that way, then change them as soon as they're out in English, or would we refrain from making pages and such of Japanese names that are subject to change? intendrone42 16:43, 3 July 2014 (EDT)
- I see no reason to hold off on a page just because we don't know its English name; it should be easy enough to come up with a reasonable translation, and if not we can use generics (like how "Mega Man's Final Smash" is the current page title). Toomai Glittershine The Cloronic 17:10, 3 July 2014 (EDT)
On a somewhat related note, any users who will be getting the Japanese version to help the research? Having people on the wiki gather info directly from the game might help us stay on top of the chaos that will inevitably ensue. intendrone42 18:25, 3 July 2014 (EDT)