You need a Hollowtech II compatible cup set such as the Shimano Hollowtech II cup sets:

http://www.wiggle.co.uk/shimano-tiagra-4500-bottom-bracket-cup-set/

or other brands that cater for the same system:

http://www.wiggle.co.uk/chris-king-bottom-bracket-cup-set/

Sorry we can only supply the options currently listed on the site.

Yes you shouldn't have any issues with these parts in this frame.

Yes you can fit the Dura Ace 7800 groupset to this frame, including a triple chainset.

There are no real differences between the 2010 and 2011 models of this frame other than the colour scheme which has seen some added white detailing to the fork, hedatube and rear stays for 2011.

Yes you can fit internal and external style bearings and chainsets to this frame so megaexo and SRAM Red will be fine. The frame does not support the BB30 standard.

We only stock one GXP press fit bottom bracket, the Truvativ GXP BlackBox BB MTB Cups with PressFit Adaptor, as linked below.

Unfortunately we can't fit the bottom bracket for you, you will need to do this when the frame arrives.

This frame does not use an integrated seat post.

The 2010 frameset comes with the advance composite technology forks and the 2011 frameset comes with the SL version of these forks.