Thread:Talk:MediaWiki 1.19/Common.css - what's new?

What exactly means New common*.css files usable by skins instead of having to copy piles of generic styles from MonoBook or Vector's css. Is that a feature for extensions which define their own skins? What does the "*" stand for? I can't find any Bug report or Revision linked to it. Don't we already have standard.css for "generic styles"?