The 4.1.5 is bug fix release only.
Bug Fixes
IM-1187 - Reporting Resource count incorrect
IM-1194 - Javascript errors on dashboard (text not properly escaped)
IM-1211 - Update EULA
IM-1212 - Update text on Welcome
IM-1215 - Assigned IP count on dashboard inaccurate
IM-1216 - IPAM - can aggregate assigned block
IM-1217 - IPAM - Sub-assigning block to same resource results in being unable to reclaim block and other weirdness
IM-1222 - Move HOSTED_COMPANY define from constants to globals