BAEによるとsystems requirements reviewが完了し、三か国の共通性能要件が確立したとのこと。

(2024/02/26)
With Japan, Britain and Italy set to begin the next phase of talks about their joint next-generation fighter aircraft next month, industry officials have said that
the partners are close to completing the aircraft’s conceptual design phase as they prepare to set up the industrial entities from the year-end that will deliver the program.
"We have completed the systems requirements review, meaning that we've now got a common requirement set for all three countries,” Jonathan Moreton, director of
partnerships and exports at Britain’s BAE Systems, told The Japan Times.

In an exclusive interview at the Singapore Airshow, Moreton, a former British Royal Air Force pilot, said the completion of the conceptual design phase will allow the partners
to move to the next stage of the program next year — the design and development phase — which is expected to last five years and lead to the maiden flight of first test
aircraft from around 2030.

日英伊のプライム三社が昨年9月に継続を合意していた作業だな。
>「GCAPの長期的な作業体制およびそのコンセプトと能力要件の明確化に関する議論を継続するための日英伊プライム3社間のコラボレーションアグリーメント」 （三菱重工）
>Defence industry leaders in the UK, Japan and Italy have agreed a trilateral Collaboration Agreement to deliver the concept phase requirements of a next generation
>combat aircraft for the Global Combat Air Programme (GCAP).　（BAE）

これで構想設計フェイズは完了に近づいていて、来月から協議の新段階に入り、企業側はJV設立の準備中ということで、最近の国内報道とも一致する。
構想設計フェイズ完了で来年から設計・開発フェイズに入れるというまさに合理的共同開発予想派の言っていた通りの展開で、基地外オッペケ念仏妄想の
ように日本は勝手に基本設計を進めていたわけではなく、コンセプト・アセスメントフェイズの共同構想設計を進めていたことが改めて確認されたなｗ