Hi Wiggy I believe its in there - it sais in the rulepack we will not be using mysterious terrain! However we will be using mysterious objectives if applicable for the mission as a test run to see if we like it!
Scenarios from the book will be used, randomly selected beforehand but no duplicates (sorry that wasn't in there!)
I reads the faq as you do - spotting distance + shroud + stealth. And it would seem silly not to use the eldar faq concerning them for the dark eldar version!
BTW I'm not sure I explicitly stated this in the rulepack but as far as I can see GW permits any army to use fortifications denoting them being taken over by other races - so by all means fill your boots everyone!