Yes, they're finally available -- Haiku Files, the archive of nightly builds for the Haiku Operating System, now has two RSS feeds for your to ingest.

There's one for the RAW Image and one of the VM Image.

http://haiku-files.org/raw/rss/
http://haiku-files.org/vm/rss/

Add them to your favourite feeder reader now, or just go to Daily Haiku.