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現在共同開発中のGCAPの実証/プロトタイプエンジンは21年12月の合意から始まったもの。

Sato said that the collaborative programme – named the ‘joint demonstrator engine' project – aims to prove capabilities
including power generation and thermal energy management in an engine that is sufficiently compact for the GCAP fighter.
“We are now sending IHI engineers to Rolls-Royce and they are sending engineers to us in Japan,” said Sato. “There are a
lot of new technologies that need to be validated. Another priority is the design of the engine to ensure it can be integrated
into the new fighter aircraft.” He said the two companies aim to develop an engine prototype by the late 2020s to enable
integration into the initial batches of GCAP fighters to be produced from the mid-2030s. Initial tests of the engine will take
place in the UK, he said.（23/03/15　佐藤篤　IHI航空・宇宙・防衛領域副事業領域長 on Janes)

>日本でIHIがXF9ベースで開発継続を示す公式情報は出てきている
ソース提示よろしく。