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.
FYI we estimate the first draft of the 7.2 IBM i book will be out by the end of next week.