Glad to hear you're enjoying the pair. I'm also leaning toward the valve option in the Isis.
My dealer is also a nice guy but he's in the business of making sales. I'm also not sure he's completely aware of everything that's happening with the brand. If an update were slated for next year, he might know and he might tell me, or he might not.
Anyway I guess these questions have no answers. Until there's an announcement from Rega, it's all just guessing.