It seems like it'll be some sort of dilithium mine that will reduce the costs of other projects . My assumption is that each tier of this mine will reduce them by a certain percentage.
It also says there will be ways to earn more dilithium in general. Not exactly sure how that'll work but I guess we'll find out.
The dev blog for this is do out in a few weeks, then sometime in june we'll get the actual holding. Get those resources ready!