i dont think there is anything wrong with CA doing it so early, they are clearly trying to meet a demand for their fans, or i think they are if i can remember correctly.
i dont fully understand why they would have it so early if they arent going to show the full routine or even music, which i have yet to hear any info about. cause in my mind if they are not doing the full routines at showcase i cant imagine them playing their music for the season in chunks. but who knows, maybe they do have full routines but dont want to debut them until they are perfected, etc.
as far as CEA, i think they have always had their showcase in october, so i doubt it has anything to do with CA.