I just hope it doesn't keep him away from the Game of Thrones set.
Anyway, when he's back in Belfast making S4 of GOT, I'll have even more reason to stalk him.
I'm sure he is under contract with the GOT production, then technically that production can take him whenever they want. Studios however, are usually quite accommodating when it comes to issues like this. Besides, I doubt his role will be big as Hugh Jackman's role will be.
No need to fear Tyrion Lannister fans!