I think the GM mode will be simulating pnp campaigns like no game has ever allowed before. It will be the real successor to the Aurora toolset.
When I see how DOS came from after it started as early access and now what they have done with the enhanced edition, I have no doubt it will be awesome.
The pre-alpha build they showed during the kickstarter campaign is gorgeous and with 15 months of more production ahead, nothing is impossible, especially with such an epic kickstarter final!