Well I haven't seen too many people suggest the RL solution to "camping", otherwise known as entrenchment. Mobile Artillery! Massive ultra long range and not very accurate, but accurate enough to put some hurt on enemies when you know more or less where they like to hang out. I'm a newb to this site, but I'm wondering if there are plans to put some artillery in there? I recall some Mechwarrior missions that pretty much amounted to, "defend the artillery". They never were fired but they sure looked like they had some good range on em. Yes, the defenders will likely have their own "big guns", but you'd have a good idea where they are hiding and they'd have a significant search radius for your own big gun(s). Your scouts fly overhead, call in targets, and then you lob the boom on em until they decide that they need to sally forth. Artillery would still need to be only good for long range shots, though maybe the recon aerotech guys could throw down a laser pointer to help guide weapons home.
Are buildings going to be destructible? Artillery would tie in great with this, and pounding on the enemy buildings could hurt their resources too... No combined arms force should ever leave home without the artillery! If it seems like I'm channelling the Panzer General games... yeah that's pretty much it. Someone said "combined arms" earlier and now it's stuck in my head.