Yes .. it fits .. I think I put a post in the "main" thread ..I've read elsewhere they will and some YouTube videos agree, so will it fit the gen 2 bike? Someone must surely know, Just the flappy flappy hoover doover on the frame is different.
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Good news on the battery. @Levo19 was correct, the main "battery" is the same. The bash/rock guard is different, so you just have to swap that over.
I guess this will mean that if you order an M2 in the future, it will come with the traditional bash guard and if you order the M3, it will come with the newer rock guard with the Aqua door.
Presumably as you can buy existing replacement rock guards, you'll also be able to buy replacement Gen3 rock guards at some point.
Or just stop being so tight and buy two bikes so you have a spare of everything already