Large infantry battles (arenas?)

[General M]

As I'm sure you all know, PS2's scale will be massive and some of the screenshots we've seen reinforce that. However, while I like vehicles and am looking forward to that side of the game very much, I was wondering whether we are likely to see any large scale infantry (maybe plus buggies)?

Obviously, most outside, open-ground combat should be and probably will be fought by vehicles, would it be possible for some outside areas to be "fenced off" from vehicles, leading to an arena style combat, maybe something like 100v100v100 gameplay. For me personally, being part of that would be awesome because it's man against man, squad against squad scenarios.

Any thoughts/ideas about it?

(BTW don't know if this was already a feature in PS1)

EDIT: Tl;dr - still large scale battles, occasionally without as many vehicles and more focused on infantry