They found "some serious issues" last week and have been working "the last 96 hours straight" to get it ready to go live; a process that is "nearly complete" The team 'won't leave' until it's done.
Brevik has previously stated the reasoning behind the rather princely sum of £130 being charged for the 'Ultimate Pack' was so that users got their money's worth.
As Marvel Heroes is a free-to-play title, most content has to be earned through unlocks but players can spend money on micro-transactions to get access straight away. The higher end packs through their Founders Program offers discounts on bundles of content, and early game access was included.
"Late last week, we found some serious issues that we felt we could not launch the game with. The entire Marvel Heroes team has been working for the last 96 hours straight to get the game ready. This process is nearly complete and ask for your patience," David Brevik.
"We always want to find these types of potential errors, so we’re glad we had the opportunity to fix them in advance of launch. We will not leave this studio until you can play the game. We hope this will be in a matter of hours."
Marvel Heroes releases on PC June 4th. Gameplay is similar to Diablo's action-RPG, and players don't have to spend money on the game in order to unlock full access to the game.