The ability to use some sort of VisualEditor is a hugely requested feature - for obvious reasons. It significantly lowers the barrier of entry required to contribute anything more than text to completely new users.
VisualEditor is not the most straightforward of extensions to setup, however. It has a complex requirement - Parsoid. We need to work out how to implement Parsoid and VisualEditor in our setup where we have automated wiki creations and thousands of wikis.