They'll almost certainly change up some dimensions to ensure new planes are built. If you kit-bash to adjust to the rules, it is likely that you could. However, those are laser-cut ribs, so you probably would have to at least cut some new ribs. Just guessing.
And there is always the possibility that they are still thinking EWS. It was that way in early Summer Institute agendas, but now says "Wright Stuff".
That said, your first plane probably won't be your contest bird, so if you have kits laying around, build to this year's rules. You can learn build techniques, trimming, and prop/rubber matching. Then drop in new plane per rules when they are known. My philosophy in coaching is to get the kids in the gym as early as possible, no matter how good or poor the plane is. the more flying they do and data they take, the more prepared they will be.
Coach, Albuquerque Area Home Schoolers Flying Events
2016 C WS 8th place
2018 B WS 2nd place
2018 C Heli Champion
2019 B ELG 3rd place
2019 C WS Champion
AMA Results: 3 AAHS members qualify for US Jr Team in F1D, 4 new youth senior records