To expand on Joey Ravn above there are three main areas to an AW match (although in some games/maps they can take a back seat). The gameplay has been tweaked slightly so I can not really provide an in depth guide for this game just yet.
On top of all this (and not so present in this title so far compared to the last one) is the CO, the commander will usually have strengths and weaknesses (some good/bad with air, ground, terrain. sea, ranged weapons, tanks, infantry...) and they have powers which can do all manner of things (previous titles included new units, upgrading units (in a power/ability sense not a "physical one": everything from speed to power to range), changing weather (snow was one which slows all units save the COs), eliminating fog of war (if present), damaging certain units and even an extra go. These powers can take a while to build up (usually via attacking and being attacked) as well (an extra go power might take ages while a more basic one can be knocked out almost every go).
Units fighting:
The rock paper scissors thing forms the basis of the game is expanded a bit.
There are air sea and ground units with each type having certain units good against each other (ground have missiles which annihilate air but can not do anything to help themselves from ground or sea).
Ground and sea have ranged units. Joey Ravn already took the upgraded units bit but they cost more to put out (funds are not plentiful) and often come with limited fuel capacities and ammo.
There is also terrain: stick some infantry on top of a mountain and they gain a bonus, likewise road (while allowing nice movement: units have movement penalties on different terrain) does not offer much protection.
Buildings:
They give you money and allow you to get new units (in some cases cities only provide shelter and repair). Only infantry (in this game there is plain infantry (cheap and plentiful), mech troops (can go up against a tank courtesy of their bazooka and are a bit harder than plain infantry otherwise. More expensive and in the other games can not move as far) and new to this is motorbikes which are faster than the above two (think recon if you played a previous game). Capture rate is proportional to HP of units so keep them full if possible.
Resources:
You get funds from buildings (and tweaks to them from various CO's), these funds pay for units to be made and to resupply them (and occasionally COs use them for various things).
The other side of this is unit resources: fuel, ammo and health.
Cities/bases/airports and some units can refuel/reammo but health is a city/base and CO power thing.
The whole game requires you to balance these in order to either decimate the units of the enemy, capture their base or fulfil a certain objective (some missions give you some troops and say last 10 days).
Edit: @Joey Ravn having not done it yet I do not know exactly but from what has been said so far it kind of resembles the early Nintendogs hacks (finding the language files and replacing them):
http://ezflash.sosuke.com/viewtopic.php?t=457 (do a page search).
Hopefully someone will appear with a patch like was done for Metroid, if they have not cleared it up by the Euro release (or before if someone wants to organize it) I am willing to be a rom hacker for this (and other titles) once I get JUS off the ground.
