The following link is to a video of the announcement of the chosen landing sight for the lander.

It is long 1 and a half hours but they go into a lot of the science behind the ship and the comet and what they are looking for and what they might or hope to find.
Might be a great amount of confirmation to some ideas OR maybe new things to consider.

For those who find this interesting get a coffee and sit back
http://www.esa.int/spaceinvideos/Videos/2014/09/Replay_Rosetta_landing_site_announcement