What are the main differences between V2 and V3?

There is a greater focus on the strategy of IT within an organization and on continual improvement. The emphasis in the new books is that processes alone are not enough to guarantee business success. Processes
have to form part of the overall strategy of the business, and have to be directly linked to business outcomes, to be effective. The lifecycle in the new books shows how this can be achieved.
In addition, there are some significant differences in the format. The previous eight books are being replaced with 5 new books covering an ITSM Lifecycle. However any changes to the basic processes are not
very radical. Problem Management has been streamlined, Request Fulfillment has been pulled out from Incident Management and given more prominence and more has been added on Event Management. Most of the best practices from previous versions of ITIL® remain intact and still valid.