Main game mode:
It would be a MMO, based around a players career in one of the houses (all included), clan (invader clans only) or merc (can change IS house daily, but gains fewer rewards(see below)).
Several planets are divided into dozens of regions each, if one side decides to attack one of those regions the defender would get a warning, and then have 5 minutes to array a defending force, the winner gets the region and it is "safe" for a short amount of time (like, 15 minutes). Shattered Galaxy
was a MMORTS with a similar system, and it was awesome.
There are 2 types of regions, ressource regions (holding side gains CBills) and base regions (holding side can repair here between battles). Each single region has its own map, and thanks to this a great variety is asured.
Each faction has a home base that can be captured if the faction has no other regions left. If they lose they will be driven out, and they will have to start anew on that planet.
"Defeated" factions can attack any base region they want in a combat drop, exept for hostile home bases. During this they will have heavy support like assault class dropships.
Combat itself would be pretty much like MWLL. Seriously, IMHO it is almost perfect, only with the difference that you can only choose from previously designed vehicles, and that your amount of spare vehicles is limited.
For example, you would start as a new clan player with a Stormcrow and a Ares tank, if you loose both you can only use your BA suit until those are repaired. (Base regions ftw
Game time would be changing. Of course its over if one side completely retreats, or has no combat vehicles left, where advanced BA types do also count. Minor ressource bases could be locked once combat started, and thus end very quickly, but base sieges (especially home bases and combat drops) and major ressourse regions might last until one side is defeated (and since people can join during gameplay, might last for several hours)
Players would pilot the same vehicle types as in MWLL, and conventional infantry might be added as bots in base defence scenarios.
During weekly server maintenance (a MMO needs those, right?
), all players gain CBills according to the time and amount of ressource bases his faction held during the last week.
Those can be used to buy new mechs, tanks, ASF, mech cocoons (more mechs to choose from, think of it as character slots from classical MMORPGs), tank slots, ASF hangars, weapons, equipment and similar stuff.
All that is pretty much a mix of the games Planetside, Shattered Galaxy, Allegiance and MWLL
Secondary game mode:
Skirmish, just your average pick a server and start shooting game mode.