I think everything has been covered, but to put it in one post so you don't have to sort through corrections...
The_Real_Chris wrote:
Essentially planetfalling transport disgorges troops as part of the planetfall, can I overwatch them? Air assault prior to disembark no, but I though disembarking as part of a planetfall was fair game?
This is correct. Planetfall does not trigger overwatch for the planetfalling unit. Any related disembark moves, however, DO trigger Overwatch.
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And as a side matter you can overwatch at the end of a transports move before troops disembark (into an assault say or to fire)?
Yes. Overwatch has the option to fire before a transport disembarks (while troops are still loaded) or after the troops dismount.
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And for good measure - if infantry have assaulted into your position (say they are in your bunker or ruins) and you overwatch them - are they now in cover?
Yes. If you need a rationale, they closed too quickly for you to fire at them while they were in the open. It's similar to the fact that you cannot fire at a formation in the middle of a move. If they can hope from one piece of cover to another in a single move, they're just crossing your field of fire too quickly for you to gain a good fire opportunity.
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Likewise if they close combat your tanks can another units shoot at them in the clear, or now because they are touching an AFV (yours!) do they get -1 to hit?
Personally, we've never allowed cover for touching an enemy AV but with the RAW, I'd have to say yes.