I got this update last night. I don't see any battery optimization features in the battery setting like I've seen on the T-Mobile post. I havn't really noticed anything new, for better or worse at all so far. .
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DEVICE HISTORY (since they got smart)
PHONES: Galaxy Nexus, LG viper, Galaxy s3, HTC Evo 4g, Galaxy Note 2, Galaxy s5, LG G-Flex, Galaxy Mega 6.3, Galaxy s6 edge, Galaxy Note 5. TABLETS: Galaxy Note 10.1 gt-n8013, Galaxy tab 3 7.0. Lenovo tab2 A8 50 WATCH: Galaxy gear