Update: Better quality Images added.
Talking about a reveal! This truly will be a goodbye set.
Pokémon Company just dropped huge reveals during Champions League 2020 Tokyo livestream of the last Sun & Moon set SM12a Tag All Stars.
Misty & Lorelei SR and Erika SR, will be SR cards in this set.
Guzma, Acerola and Lillie Full Art cards are not in Tag All Stars. They are from upcoming promo packs that will be distributed at limited Extended/Expanded events in Japan. These promo cards are from packs you can only get at limited Extended (Expanded) events, either by getting 1st place in your 8-players group, or winning a rock-paper-scissors challenge!
As predicted and confirmed before, Umbreon & Darkrai and Espeon & Deoxys finally get their Special Art SR card. There will be a Gold Mewtwo & Mew GX!
Lastly Mimikyu and Jolteon have been partially revealed from the set. Also a Hau reprint promo card will be available, you will get this if you participate on the limited Extended (Expanded) event that will come.
Also it has been confirmed the 1 Shiny Energy will be an SR card alongside the guaranteed (GX or Supporter) SR card you could get in your box of Tag All Stars.
Official images of Hau 394/SM-P, Acerola 395/SM-P, Guzma 396/SM-P, Lillie 397/SM-P.