The sections on Image Quality and Colour Management will be of great use to you if you wish to provide your printing lab with an optimized file for printing. And, if the prints come back 'different'
from your file, you will know where to find the answers to correct the problem.
There will be no update to Camera to Print & Screen this year since the major change is covered by Soft Proofing in LR4.
The best way to make a decision - apart from reading replies here - is to check the Table of Contents
for the items that really interest you.