On the previews of the new Iron Man movie they showed Pepper kissing Iron man's helmet before throwing it out of the plane (wasn't in movie)...Also a part showing the Black Widow firing one of Iron Man's gloves (not there either) 
I guess these parts will all be added to the DVD Extra's?   

I guess your guessing correctly.

it always happens in film's trailers  
itll be in the extra clips or unused scenes in the dvd

Knowing now the context of that aircraft scene in relation to the start of the movie it was much better as a deleted scene it would have made the reveal at the expo redundant for the audience.

" preveiws have a tendency to show crap thats not in the movie all the time "

Like they said, this happens

Yeah,i have seen the movie and those scenes are not inclueded.By the way thor´s hammer  Mjolnir appears in a post-credits scene!

"By the way thor´s hammer  Mjolnir appears in a post-credits scene! "

I just saw the press conference for Iron Man 2 and Favreu admitted that they took the pepper kissing the helmet scene out.

GAH! SPOILERS! WHY DID I READ?!

It's not?
Aww,  I liked the scene with Pepper kissing Iron Man's helmet.  :(

Yeah I missed that part

There's no such thing as a deleted scene these days.  There's "in the movie" and then there's "promotional material".  Everything is intentional.

" There's no such thing as a deleted scene these days.  There's "in the movie" and then there's "promotional material".  Everything is intentional. "

the op is correct. I just saw the film and those scenes are not in it