From RELEASENOTES

New user commands or command arguments

• ZMPOP, BZMPOP commands (#9484) [LMPOP and ZMPOP commands #2165]
• LMPOP, BLMPOP commands (#9373) [LMPOP and ZMPOP commands #2165]
• SINTERCARD, ZINTERCARD commands (#8946, #9425) [LCS, SINTERCARD, and ZINTERCARD commands #2163]
• SPUBLISH, SSUBSCRIBE, SUNSUBSCRIBE, PUBSUB SHARDCHANNELS/SHARDNUMSUB (#8621)
• EXPIRETIME and PEXPIRETIME commands (#8474) [EXPIRETIME and PEXPIRETIME #2166]
• EXPIRE command group supports NX/XX/GT/LT options ([Regression 6.3.0] hmget/mget casts numeric strings with leading zeros to integer #2795) [Implement Redis 7.0.0 [P]EXPIRE[AT] options #2188]
• SET command supports combining NX and GET flags (#8906)
• BITPOS, BITCOUNT accepts BIT index (#9324) [Refactor BITPOS and implement BIT/BYTE option. #2185]
• EVAL_RO, EVALSHA_RO command variants, to run on read-only replicas (#8820) [EVAL_RO and EVALSHA_RO #2199]
• SORT_RO command, to run on read-only replicas (#9299) [Refactor SORT and add SORT_RO command #2200]
• SHUTDOWN arguments: NOW, FORCE, ABORT (#9872)
• FUNCTION *, FCALL, FCALL_RO - https://redis.io/commands/function-load
• CONFIG SET/GET can handle multiple configs atomically, in one call (#9748, #9914) [Variadic CONFIG GET/SET #2192]
• QUIT promoted to be a proper command, HOST: and POST demoted (#9798)
• XADD supports auto sequence number via -* (#9217)

New administrative and introspection commands and command arguments

• COMMAND DOCS (#9656, #10056, #10104)
• COMMAND LIST (#9504)
• COMMAND INFO accepts sub-commands as args, and no args too (#9504, #10056)
• LATENCY HISTOGRAM (#9462)
• CLUSTER LINKS (#9774)
• CLUSTER DELSLOTSRANGE and CLUSTER ADDSLOTSRANGE (#9445)
• CLIENT NO-EVICT (#8687)
• ACL DRYRUN (#9974)
• SLOWLOG GET supports passing in -1 to get all entries (#9018)

Command replies that have been extended

• COMMAND and COMMAND INFO extended with tips, key-specs and sub-commands
• see https://redis.io/commands/command
• ACL CAT, COMMAND LIST list sub-commands (#10127)
• MODULE LIST reply includes path and args (#4848)
• OBJECT ENCODING returns listpack instead of ziplist (#8887, #9366)
• CLUSTER SLOTS hostname support (#9530)
• COMMAND command: Added the blocking and module flags (#10104, #9656)

From 7.0RC2

New user commands or command arguments

• COMMAND GETKEYSANDFLAGS sub-command (#10237)
• INFO command can take multiple section arguments (#6891) [Support INFO with multiple section requests #2190]
• XGROUP CREATE and SETID: new ENTRIESREAD optional argument (#9127) [XGROUP DELCONSUMER and ENTRIESREAD #2196]
• XSETID new ENTRIESADDED and MAXDELETEDID optional arguments (#9127)

Command replies that have been extended

• XINFO reports consumer group lag and a few other fields (#9127)
• XAUTOCLAIM returns a new element with a list of deletes IDs (#10227)