They are being officially released (pre-production kits) at two model shows:
Tamiya Modeler's Gallery 2019, July 25 - July 30, Tobu Department Store Ikebukuro, Tokyo, 8th Floor Exhibition Area
3rd Shizuoka Expo in Hokkaido, July 25 - July 30, Sapporo Tokyu Department Store, 9th Floor Exhibition Area