Teiid 8.5 Alpha2 is available from the download - http://www.jboss.org/teiid/downloads
This alpha expands upon the dependent join enhancements, adds broader support for must pushdown functions (offering better sequence support), and native-query support on source functions. Expect the fist Beta and an expanded blog posting in about two weeks.
The Teiid Team
With much progress on the dependent join features, I'd like to do an Alpha2 tomorrow. We are up-to-date with 8.4.x, so let me know if there is anything else that should get in before the build.