Pretty big change if Brammo is swapping battery manufacturers at this point. Unfortunate for us as would-be Brammo purchasers, as that's not a change you make right before you ship the bikes.
The optimistic viewpoint would be that Brammo found an even better battery technology.
The pessimistic viewpoint would be that Leyden Energy has decided they do not want to sell / support their batteries in EV applications, or that Brammo has decided against them for some technical, scheduling, or political (de)merit. In this case, Brammo is surely scrambling to find a suitable alternative .. and we can expect to see significant delays.
I wonder what Brammo is using in the Empulse RR, if not Leyden Energy cells. A123 has started to step up their support of EVs and EV racing. Brammo likes to call their battery packs BrammoPower .. lets them swap out manufacturers at will.