From what I remember new engine was supposed to be provided by Oreca and since they don't design and build engine themselves, good question is who might be their partner. So how do you know it will be Toyota?
About cars, normally I'd expect new gen since current cars will be 5 years old in 2025 and there was 5 year gap between current-gen LMP3s and previous-gen LMP3s. But... who knows, maybe there will be some cost cutting and adapting existing cars to new engine. Time will tell
