The one think that i didn't like in GC1 was that wormholes where so pointless. They'd only send you a few sectors and then dissappear. Wouldn't it be cool if wormholes where more like resources rare but helpful. You find a stable wormhole and use it to your advantage guard it with a space station and travel across half the galaxy in a move. Not to many just one or two and even some unstable ones were you can lose ships, so you take a risk when exploring them. Who ever finds a wormhole would be able to expand from multiple direction.
Also it might be cool to have wormhole tech to research. Like the terror stars, what if you could create a device that creates stable wormholes. Obviously it would have to be something that uses up alot of resources to make it difficult to create. But it could be used as a weapon to move entire fleets in one move to where ever you want. What do you think?