i think its because they always hinted that it was mew, because of the whole ancestor of everyone thing. and then theyve gone and said outright that the universe was created by arceus, so..
it's almost like theyre suggesting the end of pomemon, which i hope it isn't :(
yeah i can't wait for it either! though i really don't like the sound of Arceus (if a movie ever comes out about him). if i had to choose a poké god, i'd choose mew, but thats cause i'm a little old school :P
mew, definitely :D i loved him when the first movie came out lol i was 6 :P but i got the mewtwo card instead. but celebi's way up there too, and cresselia