Confirmed
Pistol
Handguns are the most common weapon in the marketing, from the store robbery in Trailer 1 onward.

Notes
Jason and Lucia both carry handguns in official footage, starting with the store robbery that closes Trailer 1.
Coverage compares Jason's usual sidearm to a Beretta 92 style pistol. Rockstar has not named any weapons.
Sources
Grand Theft Auto VI Trailer 1 (opens in a new tab)
Shows handguns during the store robbery.
Every gun spotted in Grand Theft Auto VI trailers and screenshots (opens in a new tab)
Lists the handguns seen so far.
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