Obviously I don’t know what there going to do nobody does but using crates makes him stand out as a character and they are iconic to the series so I assume they will, otherwise his toolkit will be very unoriginal/unDLC like.Pac's stays there after it's made. And we're dealing with hypotheticals atm so how do you know he'll be using crates at all?
EDIT: Sonic's and Mega Man's can be used by others too. Banjo's the only one who won't let others use it.
Also you can’t bounce a normal, metal or tnt crate on pacmans trampoline either.