This game got a very positive reaction last night, and people are really interested in it. To snatch the jewel from the crown is to take the MOST valuable/desirable part of a still desirable container. Right now, this game is the most anticipated thing from Obsidian, therefore, it is the jewel in the crown of their portfolio (because no one is dying for more Tyrant, or Tides games), and so Private Division has snatched the jewel from the crown.
This does not mean, nor imply, that they cannot make more good games in the future. It just means that the most anticipated game from Obsidian, just announced, is the game that MS doesn’t benefit from, even though they recently purchased the company.