I was wondering how they were going to do that. To be fair, we haven't seen exactly what it will mean for next season, but i'm guessing they'll give him a scar and be done with it. While they harp on his even uglier visage a lot in the third book, it isn't exactly a major plot point (at least that I've seen so far, not quite finished reading book 3 yet), so I'm sure they can do without it.
I really enjoyed this week's episode. Also they've finally made a change I like. Tyrion didn't lose his nose! I think that would have annoyed me by halfway through next season.