In short, Warner Archive's Blu-ray release of Batman: Mask of the Phantasm looks and sounds fantastic. It's not perfect, as some shots don't look as strong as others, but overall this film has never looked better. The audio mix is pretty amazing, as well. Expect a full review on The World's Finest very soon.
I'll definitely be double dipping on this. It does make me wonder how they're going to do this though, considering it was edited on video. They might have to recut every episode, like they did with the TNG blurays. It won't be cheap.