So I previously said that the last release which was 188.8.131.52.150120 was supposed to be the last patch for OBIEE. However, on the day of Pluto Fly By, Oracle released 184.108.40.206.150714. Oracle only states that this patch only fixes a major bug for Oracle Business Intelligence Third Party with bug number 20247002. I searched for this bug and could not find relevant information.
If you are stable on 220.127.116.11.150714, then I would probably not patch to this version. For more information on Oracle Support page, you can go here.