Sponsored presales (typically American Express or Audience Rewards for Broadway shows) have contractual obligations to be listed on the production's website at a certain point, assuming they have a website. I see nothing on Hadestown's website so it's probably too early to have one announced.
As for Hugh Jackman, if there was a pre-sale they would have listed it in the press release, and it only lists December 7 for "most dates" and December 10 for MSG. You should also check the venue's website + their social media in the event they have a venue presale.
Updated On: 11/29/18 at 09:55 PM
Hugh's site doesn't even break down what the VIP packages are/include, but in any event, they are usually 2-3 days before the public onsale, and will be listed on the ticketing websites.
Thanks. That presale link is for Ticketmaster in New York. It appears Ticketmaster does have presales in other cities. I'm looking for San Diego and Ticketmaster doesn't have that date. It looks like AXS is handling the HJ tickets in SD and they list a Dec. 5 presale. It doesn't say who will have access though. It looks like people should check the venues in their area for presale since the listings aren't on the HJ website.