One question. Do we know any more details about this? Are they planning to put in the SGR into the existing companion storylines? Or are they planning to add continuation of current storylines and only implement it there?
Basic summarization: We don't know yet. They've not told us directly, only that more SGR options would be coming. Not with Makeb though, these will only be NPC romances.
So what you mentioned could both be down the road, but we don't know yet. They haven't ruled out overhauling of old companions so I'm still hoping it's the case.