Wiki functionalities inside WordPress: What's alive and kicking in 2012? [free]

I’ve been searching and searching, trying and trying and up to now, I can’t find a free Wiki plugin that allow me simultaneously:
– Have WordPress users to create and discuss wiki entries.
– Have some of MediaWiki syntax and content shortcuts goodies.
– Use my theme and not some plugin specific theme.

I don’t want to just embed, but the WordPress implementation to be a front.

I meddled more with Wiki Lite and WordPress Wiki. But while they comply on some items they fail on others, or compatibility/aging issues rise.

Are you guys using something these days, what’s working for you? What WordPress version are you using/stuck with?

I reeeeaallly wanted to have a mindset mapping tool like a wiki in my WordPress site and would appreciate any enlightenment. Cheers

Cheers
probiner