celestine-3:27017 is a working mongos instance

1.6.5 mongo works fine:
xm@celestine-3:~$ /opt/mongodb/bin/mongo celestine-3
MongoDB shell version: 1.6.5
connecting to: celestine-3
> rs.slaveOk()
>

Current (yesterday 'nightly') behaves strangely
xm@celestine-3:~$ ./db/bin/mongo celestine-3
MongoDB shell version: 1.7.5-pre-
connecting to: celestine-3
> rs.slaveOk()
unrecognized command: replSetGetStatus
>

Connecting to mongod works fine.