The SR2050 book has an exhaustive gear list including prices and availabilities, which in a lot of cases are totally different from SR4A/Arsenal. I imagine further 2050 books will follow up with the gear not in the book.
As for how to handle it in HL, I'd be very tempted to have 2050 as a seperate game thus preventing any possible cross polination.
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but give you optional rules that can allow it all to be added back in
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I'd really not allow this personally! It's just not plausible and would polute the timeline too much.