The DAO hard fork pull requests on GitHub for the leading clients were very recently updated, with what looks like the final code:
Geth: https://github.com/ethereum/go-ethereum/pull/2814
Parity: https://github.com/ethcore/parity/pull/1483
The MainNet block on which the HF will occur is set at 1920000, which should be reached on Wednesday, 20 July.
We can probably expect official client releases and announcements soon.
Update: With the latest code, both Geth and Parity will default to pro-HF.