I also finished the game. I wasn't expecting it; Chapter 8 is extremely short and I thought there were more to come, aside from the epilogue.
[SPOIL]The ending was pretty good. I loved how Layton outwitted Descole. He really is the new Don Paolo. xD
I was right; Randall turned out to be the Masked Gentlemen. The revelation that the Mask of Chaos and the Mask of Order are one and the same was excellent.
I was very shocked to see a reference to Eternal Diva, especially since it seems it will play a major part in the next game. I want to know about this mysterious guy now. I had never thought about who was under Descole's mask until he took it off. I hope we see Descole's face in Azran Legacies.[/SPOIL]
[spoil]I really liked the ending too. It was just so heartwarming. I don't get how Descole disguised himself as Angela, though. And especially since she was married...
I was a bit surprised too. I thought Eternal Diva had just been a spin-off adventure for Layton and co. That last foreshadowing cutscene was totally awesome... I almost died of laughter when they added bouncy side effects as Descole knocked out those mooks, though. I also don't know whether to love Bronev for having such an awesome voice, punching Descole, and almost taking off his mask
(DAMN YOU RAYMOND! *rage*0, or to hate him for punching Descole (yes, yes, I know). I also like PLvsAA a bit less now since it's gonna push Azran Legacies back by a year.[/spoil]
The soundtrack for Miracle Mask is really good, too - I think they really made good use of the 3DS' improved sound technology. I like the Ending Theme, the Opening Theme, the Fierce Chase theme, the Scorpion Casino theme, the Monte d'Or themes, the Ready for Action! theme, the Robot Showdown theme, the live Descole theme, the... well, pretty much every soundtrack in there.