Thread:FairySina/@comment-29268934-20161216192444/@comment-6078077-20161223175619

All seasons since HaCha have had form changes in their preview leaks already:
 * 1) Happiness Charge had the cards floating around
 * 2) Go! Princess was shown in their mode elegant gowns
 * 3) Mahou Tsukai showed Dia - Topaz form

A La Mode doesn't show anything like that, so, until it is revealed, I doubt it will have form changes.