Most people agree there will not be another generation of the Mazda 6 sedan. Even though there were plenty of rumors of a new one based on their new RWD platform shared with the CX-60.
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Source: Cazado el Mazda6 (eléctrico) en nuevas fotos espía, un vistazo exclusivo al japonés que promete +600 km de autonomía
The Deepal-based Mazda 6e has recently been spotted testing in the UK, according to a post on Reddit. The camouflage wrapping is unusual, due to the 6e already being sold in the EU.
Source: https://www.reddit.com/r/mazda/comments/1njg8sn/spotted_the_6e_sneaking_around_the_uk/