Who cares? The positions of Arnold, Guiliani and Pataki aren't close to a majority of Republicans nationwide. Unless these gentlemen get up there and deliver rip-roaring speeches in favor of abortion and gay marriage (highly unlikely), what they say will make little practical difference.
What they will say will be very helpful to President Bush. They will all praise his leadership and explain why he should--needs to--be re-elected.
You are right, of course they won't be advocating the issues listed.