I'm not gonna lie, I like Starkiller's old lightsaber style better.
All that can be determined with certainty at this point is that Starkiller is alive again, and it takes place after TFU and before ANH. In either case, if we're lucky he'll be killed off for good this time.
"Grant Allen [...] had written a book about the Evolution of the Idea of God. [...] it would be much more interesting if God wrote a book about the evolution of the idea of Grant Allen." ~ G. K. Chesterton, The Everlasting Man