Just to keep the thread in touch, me and Terios are halfway done through the new update, it's quite a big one so I'll include a couple of teasers for it here:
-Everyone has an actual transform animation that isn't just rolling into a ball
-Sonic, Mighty, Tails, Shadow, and Amy will be able to transform into Super.
-Super Tails has his flickies with him during his superform.
-A duo system for SonicRE and TailsRE (and also a secret duo if you use Modern Sonic)
-Most sprites look smoother and more detailed (Mighty's hammer ball, the new superform sprites)
-Everyone has actual spindash sprites
-Superforms actually have a glowing color right now instead of a slate color
-Shadow's coloring is now his dark parts of the fur instead of the red stripes
-New icons that were missing for certain characters were added in
-SallyRE and AmyRE are coming. SallyRE will have similar abilities to her 2.1 port, except with a few differences. AmyRE is having a complete new moveset.
-Legacy Blaze will be getting more fixes, mostly about her superform sprites.
-SonicRE can bounce infinitely now, just like Adventure 2.
-SonicRE's eyes are red during his super form, and TailsRE's eyes during his super form are orange, as a reference to Modern Super Tails fanart.
Keep in mind that the thread has NOT yet been updated. This is just a teaser of the changes.