Differences between V11 & V12

V11 V12
All content have default expiration dates No expiration dates on content by default (can still be manually added)
Second approval publishing on by default (except for risk accepted excemptions) Workflows switched off by default (direct publishing)
Workflows can be set up at business request
Over 240 blocks Less then 50 blocks with more flexibility
External reviews option External reviews now a gadget option
Navigation items created by admin as blocks Content editors can create navigation pages