Is everyone who played in Twilight still going to be in New Moon?

yes, the main cast is returning. Except, it hasn't been сказал(-а) if Elizabeth Reaser (Esme) will be returning. Embry and Sam, played by Krys and Solomon... We don't know if Krys will be returning, but Summit confirmed a week назад that Solomon will not be returning as Sam

As far as I know, all of the original cast is going to be in New Moon. well, except for Cam Gigandet of course, since James is dead.

I'm not sure ... from what I've heard, most of them are

um i think that venessa hudgens is probably gonna play Leah and i forgot the rest but most of them r coming back

Ya most stay i think some of the school cast leaves though

Embry & Sam from Twilight are not going to be in New Moon

Yes they are all returning but for Eclipse, Victoria is being replaced.

Yes nothing changed except in the third (Eclipse) Victoria is played by a different person.

Yes, everyone who starred in Twilight was still in New Moon.