As I understand it, multiple loyal chapters including my fellow Dark Angel brothers will be on there way through the warp as I speak.

With the presence of Orks, Eldar and Chaos rumoured to be heading to the Kharon system also, I cannot fathom there being an easy way onto the planet.

Will all forces be orbiting the planet on arrival, or spread around the system?

Ship to ship fighting above the atmosphere would create an opening to drop onto the surface of the planet.

It would depend on what the space around the planet Arkhona is like.
There could be a massive debris field around the planet which would only allow ships to dash in and drop off reinforcements and supplies, but not stick around to provide support.

After reading the thread the opening cinematic for halo 4 spartan ops popped in my head.

View: http://www.youtube.com/watch?v=d66NOXhwfoI

Go to time 4:50 for the deployment.

Put in a lot of Thunderhawks, Drop pods, Ork Roks and the other deployment units used in the lore and a few hunderd huge warships of the different factions fighting it out to get in to a orbital position.

I would like to see it as a kind of 'instanced' battle where you can take over parts of a ship to win (engine room, command chamber, bridge....) This gives a whole new area to fight in to break the monotony of planetary warfare. I can imagine zero-g fighting in close quarters. No player controlled ships just boarding actions.

The thing i come to think of is somthing like this.

Having 4+ fleets hanging around the planet would just result in baneblades raining down to the planet.
The fleets would probably withdraw to some other place in the system.
To supply the planet with troops, tanks, amunition and so they would make fast supply runs down to the planet.
Down on the surface we have large lascanon and other defence systems that could fire upon the orbiting ships.
If the Defence system is controled by your side it fires on all enemy fleet supply runs so you get a chans to disable the ship in orbit.
If you manage to disable a ship in orbit you (and probably everyone else) could raid the ship, take resources relics and all fun things on a ship. ofcourse the owning faction would get to defend the ship.
The time you have to raid the ship should be limited so you have to hurry. when the time is up the crew manage to get the ship moving and goes to safety. (you probably should hurry to get of the ship then.)

The fighting on the planet would get realy motivated to capture the defence systems on the ground so your side can get the supply run from your ship and to shoot at the enemy ship.

These sound like great ideas so far and I like them but we ready have a void ships load ( victory class to be exact ) of threads on this. So please use the search function and copy and paste these ideas on those threads. Also though this will be cool don't you think the devs should focus on the gameplay which is mainly infantry based. It would be cool post-launch