Well, Wikia has put in tons of new features, some of them being optional. So here is a list of those features, their status here, and why or why not they're enabled.
Polls - Enabled
Polls are enabled because they're very useful for debates.
Top 10 Lists - Disabled
Top 10 Lists are disabled because they're just glorified polls. You also can't change your vote in a Top 10 List like you can in a poll.
Achievements - Disabled
Trust me, you'll thank me later. Click here.
Layout Builder - Disabled
More hindrance than help, trust me.
Blogs - Guess
Blogs are useful in fanon wikis. So yeah, blogs are enabled.
Article Comments - Enabled
See last feature's status summary.
Category Exhibition - Enabled
Though I don't see the point overall, it can be useful sometimes.
Chat - Enabled
Useful for discussion. Keep it on-topic.
One of Wikia's few new features that are useful. This features many more menus than before.
---****--- Roads 19:08,1/18/2012