Can i play as and encounter POC in this game? And what are the gender options in char creating like? If there is character creation.

Judging by the preorder cosmetics, you can play as either a male or a female. As for ... other options ... well, the Inquisitorial motto is: burn the heretic, kill the mutant, purge the unclean.

Yes, I have had a look at the gameplay footage and will say that unless it was a serious trick of the in game lighting I have seen NPC's of colour in the game.

However the character creation seems to be strictly limited to preset ones, but there are a number of different types and skin tones that look both male and female in terms of variety that the player can choose from. Apparently You don't get to do any alteration apart from the things you get to upgrade your gear.

In 40 Millennium people are not racists when it comes to skin colour. All positions in the Empire are open to anyone, be it admiral on inquisitor. Of course as long as you are human.
But as it comes to ... gender theory ... well debauchery is one of the aspects of Slaanesh. And that is heresy.

Character creation is very limited. There are about ten predefined portraits of both men and women. You can choose people of different ethnicity. Though the range is limited. 2 of African descent (1 male and female) and 2 of Asian descent (1 male and female) and several of Indio-European descent. So a pretty broad range of portraits for the remaining ones. But like I said over all it has a limited character creation. But for what it does have there is a varying representation so a bit of something for every one with in the limited scope of the game.

the game lets you pick from a variety of people, and the warhammer: 40k universe is devoid of the concept of gender entirely, and basically the entire game doesn't contain any references to sexuality of any kind. They do, however, adhere to a strict humanity-first policy and they have a strict religion. Indeed, the concept of gender is obsolete with cybernetics and only the specific sex you are born with remains.
that is to say, the dna you were born with- not the genetalia

edit: after doing some research, the imperium of man is an extremely strict kill-everybody-that-moves fascist theocracy and being lgbt gets you branded as a Slaneesh cultist. In warhammer 40k, there is only war, and absoutely every creed and identity gets absolutely devastated by it, there is no equality or peace, only violence.
That being said, living in necromunda is what I said above. Nobody gives a shit, you get shot either way.
the whole point to the game is that there are no good guys. everybody is evil and hideously corrupt.

Stop spamming every game with your bullshit.

what's a PoC? is white not a color?

no, white's better