As was implied by the English Scarlet & Violet set description, we will indeed see the return of full art cards in Generation 9. A full art version of Oinkolone ex was just revealed for Scarlet ex and Violet ex.
New “Illustrator Rares” of Wiglett and Sandile have also been revealed.
The official Pokemon TCG YouTube channel showed an example of what will come in a booster box:
The Japanese set will release in Japan on Friday and overseas on March 31st.