Several blogs have already been written about new functionality in OBIEE 12c.
Mark Rittman, for example, posted a good one here
[https://www.rittmanmead.com/blog/2015/10/oracle-business-intelligence-12c-now-available-improving-agility-and-enabling-self-service-for-bi-users/]
.
Now, I've personally had the chance to play with it for a few weeks, mostly in
Answers and some