So after a good 8 hours of 360 gameplay yesterday and another 8 hours on the pc version today there are some rather key differences in each beta which I would think are not so different in the final game.
Main differences:
PC - unlock more gear, perks and weapons, can level above rank 2 (I seen rank 10's)
360 - very limited unlocks, like 1/5 of the pc amount, max level is 3 and feels slower to earn.
The out of bounds area on the pc is different to the 360, on the first area of the map you can only go to the bottom of the snipers mountain before you hit the OOB area if you are the defending team, on the 360 however you can actually go up the mountian and knife the snipers, same applies in area 2/3 where the forest around the two houses with a bomb in is OOB for the pc version, on 360 you can go right up to the wall which makes sneaking around and camping earier. These might be balances as I feel the PC version is much harder, more skilled mouse & KB players picking you off.
I take back what I said about the 360 version showing the consoles limits, as the pc version takes some beef to run at 60 in the middle of a fight, trees even on full still look rather iffy on the PC but it also becomes part of the game's visual style.
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I tried to force DX9 from the ini file but it turned itself back to "auto", the character detail part of the ini just changes how soon a model drops to low quality when far away, it's worth sticking it on "low" as I don't see much change at 1440x900 and it helps the game run smoother on non top end cards.
I found the sweep spot where I can have a few visuals and keep the game around 30fps in all areas, of course jumping up to 60 when inside a building or not looking over the map, if anyone else wants me to post my ini file settings just ask, I am running on a gtx260.