My money is on a new barrel system.
Something to take on (and beat) the ultralite.
Oh yes!
........er no, but seeing as you mention it, it might be an idea for me to look into but as I did say that if I ever did bring anything out, it would necessarily have to be an improvement, and barrel technology is about as good as it gets I think.
Those tubes are machined to sometimes a tenth of a thou [if designed to] and so I can't see I'd be able to improve those guys unless of course I improved them aesthetically but that seems sooo limp ... Nah, I'd rather make stuff that improved performance in some way and not just looked better.