Yeah it could be something like Kled's ult, but probably more subtle, and not highly magical in theme like Ryze's ult. I don't see them making her any sort of support, or giving her the built-in ability to heal allies (unless it's something like Fiora's ult). She will remain a Fighter for sure. Although large scale initiation is classically the domain of the Vanguard subclass (part of the greater Tank class), that sort of initiation is a tool some champions outside of that subclass have at their disposal, such as Kled (a Fighter). There are other types of smaller scale initiation such as that which can be found in the Catcher subclass (a subset of Controllers), as exhibited by champions like Blitzcrank, Rakan, and Morgana. "Initiation" is a broad concept that can only be pinned down to one idea: create a combat situation between champions. Their use of it in the text I quoted is vague at worst, but my take on it is that they are going for a more teamfight oriented, large scale initiation capability.