Only a guess, but I reckon EZY will move to T1, thereby making room for LX & LH to move to T3. The Diamond lounge could then become an exclusive BMI/LX/LH lounge.
Also I would expect KLM to move over to T3 too, to join Air France.
Could even see BA & AA move to T1 to join their one world Finnair / Aer Lingus partners thus making more room for Star Alliance at T3.