To answer your questions more directly... nothing is banned right now except Admiral Daala.
There are numerous minor errata for cards that WotC posted:
https://www.swmgamers.com/PDF/Rules/Sta ... _Final.pdfBut basically none of the WotC errata are for balance. Just fixing typos and retroactively making old cards fit new naming formats, etc.
In the balance committee thread I posted, you'll see that several cards have received changes that nerf them enough that they might as well be banned, but they're all still legal other than Daala. They're all V-set pieces.
The only decisions from the Balance Committee that affect WotC pieces are:
* ruling on affecting activations like Dodonna (must have line of sight to an enemy),
* give Diminutive to Mouse Droids,
* Ysalamiri goes back to its older WotC definition (it had a change midway through WotC days),
* Rapport cannot reduce a character's cost below 3. (Original rulebook says below 1.)
* and ghosts are considered non-living.