Edit: Instead of answering the incredible amounts of replies, I'll address the common concerns here in bold. The rule has been updated to address some things already discussed.
Everyone, here is the new rule on full page scans. It has been approved by G-Man. I am posting this in separate threads, as well as posting it in the rules thread.
Remember that this rule is legal in nature. This has nothing to do with the complaint of users scan-bombing. The law technically says that no full page scans should be used. There is no right to reproduction if the copyright owner has not given permission. Battles have been a part of Comic Vine for a long time; we have gone this long without intense scrutiny. However, it would be naive to think that this will last forever. We have had some complaints already from comic companies. The site is willing to stick its neck out for three full page scans.
Manga is covered by this rule. Just because foreign companies have not pursued infringement in the past does not mean that we can ignore their rights. This goes for webcomics, too. The caveat is if the publisher/owner has given permission to reproduce the content. Rare, but it happens when people truly want their work out.
The argument that using scans promotes picking up new books holds no water. That is a great side effect of sharing comics, but it is not an exemption for potential copyright issues.
A workaround is by posting links to external photo/scan sites. We don't have any control over that. We just don't want the full scans on our site. Also, links to videos of the full comics are against the rules, as that is akin to linking to a pirated copy.
We understand that people will be sensitive to this new and supposedly harsh rule. We just want to make sure that Comic Vine is able to continue operating without much interference from outside (legal) forces.