User blog comment:Rappy 4187/Technical Update: November 30, 2015/@comment-24473195-20151130232317/@comment-126761-20151201145927

For Insights data issues - please continue to send them in to Special:Contact/bug, we'll look into them.

ImportJS info will be coming soon!

Deciding where to use the Ace editor is a difficult question, and we're looking at ideas for further improvements (such as being able to switch between editors at will). Slightly confused by the mention of .css and .js though - we already do that, and we're not taking the Ace editor away from those situations.