Is Grand Theft Auto 6 coming out soon? Probably not. But, it appears we'll hear more about the next GTA game before the year ends.

According to a forum post by the GTA 6 dataminer, Tez2, Rockstar Games could reveal more about GTA 6 later this year. To be more specific, the announcement will reportedly be part of the 10th-anniversary celebration for GTA Online.
Tez2 speculates Rockstar could use an event similar to "Treasure Hunt", which led to the reveal of Red Dead Redemption 2.
Although this info remains unconfirmed, the timing does line up with the next big update for GTA Online. After the end of the Los Santos Drug Wars expansion with the Last Dose update on March 16, GTA Online developers confirmed that they have something special in mind for this year's Halloween event.
So, even if it's not a GTA 6 reveal, we do know that something big is coming to GTA Online in September or October.
Ultimately, GTA 6 will be revealed sooner rather than later. The upcoming game is too big to be delayed to a later date and Tez2 agrees with this. Apparently, Rockstar is willing to cut content from GTA 6 to meet its late 2024 and early 2025 release window. But, weirdly enough, we didn't see Take-Two Interactive mention GTA 6 as part of its latest earnings report.
Fingers crossed, we'll sniff something out from Take-Two Interactive and/or Rockstar Games within the next quarter.