With a couple of Soul Calibur releases coming up in the shape of Soul Calibur II HD Online and the free-to-play Soul Calibur: Lost Swords, Namco Bandai seem determined to push the franchise further as they have registered another trademark for Soul Calibur: Unbreakable Soul. According to the application it could be both your standard video game or perhaps even an arcade release, but the filings even mentions TV shows and electronics. It is of course far more likely this has to do with a video game of some sort.
It's not been all that long since we saw a new entry in the main series as Soul Calibur V was released early in 2012, but it might be time for Namco Bandai to show a next-gen Soul Calibur.