At least we now know why there was no marketing for this. lol
They talked about it at the game awards.
Quoting for new page since this is a good summary.
1. Halo Wars Definitive Edition is announced as pre-order bonus for Halo Wars 2 Ultimate, releasing today December 20th.
2. On December 20th, description of game is stealth updated to declare game is in fact "early access" (no mention of this previously) and list issues with game, not revealed when pre-orders were opened.
3. On December 20th, arbitrary date not previously revealed is set, whereby anyone who pre-ordered before December 20th but did not meet said arbitrary date, won't actually get to play the game today. No mention earlier of "Pre-order by December 14th to guarantee you get to play on day one!", no, because that would make too much sense.
You don't see how this, especially point 2, is a problem?