From the release notes:
Fixed bug in MaintenanceScheduler introduced w/ merging compactions
Fixed bug in the FileBlockCache wrt growing to accomodate
Added support for DELETE lines in .tsv files
Added check for DFSBROKER_BAD_FILENAME on skip_not_found
Added –metadata-tsv option to metalog_dump
Fixed bug whereby get_table_splits() was returning stale results for previously dropped tables.
Added MaintenanceScheduler state dump via existence of run/debug-scheduler file
Fixed FMR in TableMutator timeout