If those giant elephant like vehicles dropping off the warthog towards the end of the E3 trailer driveable in multiplayer. If so I will be having the best time of my life transporting spartans from one base to another 
I doubt it but it would be quite awesome if it is on some BTB maps.
I hope they are. Who knows if they are carrying them on the Infinity why not use them in the simulator (war games, AKA multiplayer) I’m sure they will replace the Elephant in BTB. That’d be awesome, I hope they have more than one BTB map with those.