I’m gonna be optimistic about this because I like the way it looks, but I have 2 points that stand out to me.
1) If you’re just keeping the same characters and same VAs, why not just continue FiM? This is similar to the “World of Warcraft 2” problem that Blizzard has always had, in that they could never do anything so radically different as to justify labeling something a sequel, rather than an expansion. So why couldn’t this have been MLP S10?
2) it’ll be jarring hearing the familiar voices coming from visually very similar, but ultimately entirely different characters, since this is presumably not the same universe.