Reading only a snippet of the opinion, 100% chance of appeal. At the very least, the court effectively says it has no authority as to why it can issue a nationwide (instead of statewide) injunction; you'd be a fool to not at least appeal that. The fact that the court also came to a different decision from both Apple and Epic as to what constitutes the appropriate market for determining monopoly also seems like it would be fruitful grounds for appeal.

Will Apple win? I don't know 9th Circuit or the applicable law anywhere near enough to answer that question.