In this video Steve Will, Chief Architect for the IBM i, talks about some of the highlights of IBM i 7.2 TR 1 that was released November 11, 2014.

When I asked the Redbooks team, Wednesday December 3, about any IBM i 7.2 books or documents I received the following reply:

Nothing out yet for 7.2 but here's a list of our IBM i docs, covering up to 7.1: http://ibm.co/1vO22mr

In a further communication, Thursday December 4, from the Redbook team they did say when the when the first IBM i 7.2 publication would be available.