In less than a year after Oracle OpenWorld in September 2010, Oracle released User Productivity Kit 11 as promised in July 2011. UPK 11 is the next generation of UPK, building on the previous successes of UPK 3.5 and 3.6.
Why UPK 11, instead of UPK 4? Well, Oracle needed to bring the UPK version numbering more into line with Oracle's other products, like E-Business Suite 12, PeopleSoft 8.9, and Agile 9.3. So they chose UPK 11, instead of UPK 4. (Apocryphally, UPK 11 = UPK 4 plus Knowledge Pathways 7.)