Latest Patch situation for Oracle EPM release 18.104.22.168
This release was only made available in the last week of Jan 2015 but already there are PSU available as below and recommended in KB Article 1400559.1.
Smartview version 22.214.171.124.400 is currently recommended for use with all versions back to 126.96.36.199.500+
KB Article 1932533.1 indicates that BI+ Production Reporting (i.e. Interactive Reporting, the old Brio product) will not be in any future EPM release beyond 188.8.131.52
KB Article 1932177.1 indicates that WA (Web Analysis) will not be in future EPM releases beyond 11.1.2.x (unclear if this means 184.108.40.206, but intent is clear).