OK, this is my take on a next generation mane 6. See mlpforums.com/topic/118834-alt… for my choices.

Note that the pink filly with Twilight Sparkle's mane cut is supposed to be Cadence and Shining Armor's theoretical daughter — the new element of magic. We'll call her Princess Skyla for want of a better name.

It's based on:
apple_bloom_happy_rearing_vector_by_kingharald-d5f3t8v.png
flying_scootaloo_vector_by_natalistudios-d5mch2e.png
peachy_pie_by_kooner01-d4bq3b1.png
sweetie_belle___pyramid_by_thatguy1945-d6yfgft.png
vector_filly_twilight_sparkle_by_kyss_s_by_kysss90-d55xmya.png
vector___zipporwhill_by_justinkwork-d781rjz.png