which is proper?

Babe, they're both okay but first collo 'cuz easier said

"You all will" is something only a non-native speaker would say.

Yes Con except possibly in the Southern US where it's considered entirely acceptable in everyday conversation

I am a native speaker (Northeastern US). "You all will submit" seems natural to me.

Even more natural Max, "You'll…"
Still I find "all will" awkward

I thought they used "you all" when addressing individuals as well as groups, so that it just means "you", not "all of you". Isn't that right? Like in the joke where a "good old boy" drives to New York and when he is nearly there he calls into a gas station and the service guy says "How's your oil?" and the Southerner replies "We all's fine, thanks, how's you all?"

I have read that you all/y'all used to an individual may imply "you and your kin", and also that Southerners say e.g. All y’all, all of y’all, or alls y’all to indicate a larger group than is necessarily implied by y'all

You can be both singular and plural. So can ya'll or you all, in my experience. I pretty much grew up in central and south Florida, and that is how it was used.

I have observed that Yankees trying to say you all are very conspicuous. If you are ever in the South; avoid the usage. You will only sound phony.

Is that why people looked at me oddly when I said "Sho' nuff!" in South Carolina?

Why bless your heart, I think you've got it.

This all came about because of a post ABOUT "grammar Nazi's" today. And I ended up hysterical. THANKS EVERYONE!!

I agree.

No apostrophe please, fer chrissakes.

I wondered about this, but decided not to say anything, because some style guides say it is OK to apostrophise plurals of contractions e.g photo's (photographs), taxi's (taxicabs), also letters (dot your i's and cross your t's), numerals (the 1970's). Nazi is a (German) contraction of National Sozialistische Deutsch Arbeiter-Partei. Personally I would leave them all out. Older UK texts show an intitial apostrophe for 'bus (omnibus), but nobody uses that any more.