Suddenly interested about knowing the History and all the past versions of OBIEE including all its predecessors and major acquisitions :

“These products have a long heritage with Oracle BIEE being based on Siebel Business Analytics which was originally created by nQuire in 1997 . The following major releases of the software have occurred” :

Siebel Analytics 7.0 – 2002
Siebel Analytics 7.5 – 2003
Siebel Analytics 7.7 – 2004
Siebel Analytics 7.8.2 and 7.8.3 – 2005
Siebel Analytics / Oracle Business Intelligence 7.8.4 and 7.8.5 – 2006
OBIEE 10gR3, 10.1.3.2 – Jan 2007 (MAUI)
OBIEE 10gR3, 10.1.3.2.1 – Apr 2007
OBIEE 10gR3, 10.1.3.3.0 – Aug 2007
OBIEE 10gR3, 10.1.3.3.1 – Oct 2007 (Enhanced Localization)
OBIEE 10gR3, 10.1.3.3.2 – Dec 2007 (Essbase Integration)
OBIEE 10gR3, 10.1.3.3.3 – May 2007
OBIEE 10gR3, 10.1.3.4 – Aug 2008 (Disco Migration ,Workspace Integration, SmartSpaceIntegration )
OBIEE 10gR3, 10.1.3.4.1 – Apr 2009

As of today :

The latest shipping versions are:
OBIEE: 10.1.3.4.1
Future expected version : OBIEE 11g (Negril) – A Major and Mega blockbuster release .
Thanks Darryn for the above inputs .