The big complaint I always hear about EVE is that it's stale. Legion integration has the potential to add a whole new layer of depth to the game and to drive new and interesting types of conflict.

There's a thread I wrote a while back on how to do a combined PvE through exploration linked in my sig. Someone posted it up in the EVE forum, and it got a pretty lukewarm reception there, despite lots of enthusiasm on the DUST thread. I still think it would be incredible to have the equivalent of "Dungeons" in Legion where your squad is deployed to a wreck in EVE by a pilot who shares coms with your squad. There would be 2-way interaction where actions in EVE would trigger events in Legion and vice-versa. Imagine working your way through a Deadspace-like wreck with dark corridors, traps that trigger rat spawns in EVE, turrets to hack that will assist your EVE pilot, generators that the EVE pilot has to power up with a remote energy transfer module to restore gravity to allow your team to push forward. Picture a competing EVE pilot inserting his own Legion squad into the fray. Now you're fighting drones and other Mercs, while trying to support your pilot in space.

That's the kind of gameplay that would be really incredible, unlike anything that's ever been done before in gaming, and would really shake up PvE exploration in EVE. I actually think this is pretty reasonable to achieve too. You're talking about adding triggers in each game that make CREST calls to activate in the two games. The hardest part is designing the map.