Here are the synopsis of all four, along with cover art: http://trekmovie.com/2010/01/10/summ...g-this-summer/
The one I was most looking forward to was The Hazard of Concealing
, which would have dealt with various powers (including Starfleet) wanting Spock Prime's future knowledge.
The novels have given Spock many adventures between and beyond STVI and "Unification". When the character survived STXI and was put on a bus
, one of my first thoughts upon leaving the cinema was what continuing adventures he'd have in the novels set in this new timeline.