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Jack's enduring appeal is thanks largely to the fact that he was never caught, allowing for a whole host of possible explanations to be conjured up regarding who he was and why he murdered his victims the way he did. It's for this reason that he's so popular with speculative fiction writers.
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Jack has already made an appearance in the world of Pax Britannia - specifically the fifth Ulysses Quicksilver adventure Blood Royal - which allowed me to provide my only imagined solution to the mystery, and I am planning on having 'him' return in the future.
And the latest theory as to Jack's true identity? That he was none other than Inspector Frederick Abberline - the very man tasked with capturing the Ripper! It's certainly an intriguing idea, and one that would doubtless make a good subject for a novel...