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I doubt there's any extra info as of yet. TM show off their upcoming releases at these shows normally 8 months or so before release with little extra info at the time.
It comes with a few extra back straps but other than that I'd expect it to be largely similar to the original G17
I'm sure the Glock will be solid but it wasn't that long ago they released a 19, and just before that the 22. Of course recently we've also had an influx of Umarex Glocks and WE Gen 5''s. Would be cool to see something significantly different about this one. I'm always a fan of airsoft guns which don't require tools to takedown or more relevantly in this case, adjust the hop. The G19 is adjustable without stripping but you need a thin tool to do it.
I expect it'll be an update of the classic TM G17, new blowback unit and nozzle arrangement for more efficiency and kick. Probably use better looking materials for the externals too.