I’m going to wait to see the specs but I’m considering replacing my M1 Max with the M3 Max (when it comes out later) if the new “3nm” process gives significant gains. Do I need an update? Absolutely not, I love my M1 but upgrading has become fun again in a way it stopped being many years ago (~2014-ish or earlier) on Intel.
The M* line of MBP are just so awesome to use.
Gurman does not specifically say Apple will hold an October event, or whether new Macs would arrive via press release.
I seriously doubt it will be just a press release. If anything deserved a press release it was the M2 but no way Apple is going to release a jump to 3nm without an event.