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Based on what has surfaced, it seems they will be opting for HDMI rather than optics and the image in the invitation hints at some universal remote capabilities.
My guess/hopes are
HDMI-CEC support which will solve the issue of many new TV-remotes not supporting the IR-signal required by the current Playbar for remote-support.
Support for newer standards not supported by the current optical cable; DTS, Dolby Digital Plus and potentially Dolby Atmos
HDMI in and out allowing for control of set-tops, the new Apple TV etc. via the new Playbar's HDMI-CEC
Voice-commands (Alexa and Google when ready) not only for music but also basic control of the TV via HDMI-CEC and other devices, e.g turning the TV on/off, pause and play.