Nintendo on an IGN article has stated that Metroid Prime 4 "is well in development" so it could be coming out next year or so.
Source: https://m.ign.com/articles/2018/11/15/nintendo-metroid-prime-4-is-well-in-development
£39.85 delivered is a really good price and it's bound to increase once Nintendo publishes more info and release date, as it happened with Smash Ultimate.
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Chief Bargain Hunter