Its still to early to tell if this is a series reboot, sequel, or prequel even though to me, what we say looked more like a reboot more than anything else.
Interesting thing I just realized that I haven't seen anyone else mention yet.
The original Kratos and this new character both have a similar scar on their stomach/chest area.
This was where Zeus stabbed Kratos.
This new character looks MUCH older than the original Kratos as well.
The end of GOW 3 Kratos seemilingly crawls away leaving a trail of blood implying that he may be alive.
Could Kratos have survived, gone off in hiding and years later started a new family of another culture? (This theory wouldn't work IMO because it wouldn't explain the change in facial features.)
Another important thing to point out is that this character already has the red mark and seemingly has the ash curse already.
Still too early to tell for sure though. Definitely interesting that he already has the curse mark and a similar scar.
Now using common sense(not insulting you), what does this hint to? Yes Michael Myers was still named Michael Myers in the Rob Zombie reboot, but his origins and even character design was changed. Same thing with Tomb Raider. With GOW on the other hand we are not seeing this.