Historical clue formulations

• Developing, say — 2023-03-16
• Still being developed — 2019-11-07
• Not yet born — 2019-04-28
• 1993 5x platinum Nirvana album — 2013-11-10
• Not yet delivered — 2013-10-31
• Unborn — 2013-02-26
• Under development? — 2012-04-08
• Not yet born — 2010-06-09
• Like some surgery — 2007-11-02
• Yet to be delivered — 2002-02-16