From the BBC "The AAIB said the problem might not be confined to the 787 and recommended that regulators conduct a safety review of similar components in other aircraft."
Does anyone know if there a reason they would have to say that (rather that "turn them all off now") for types other than the one they are investigating? I can't think of one unless they suspect some 'unfortunate' interaction between an ELT battery issue and the 787 systems that wouldn't affect other aircraft types?