Well as we all know SQL 2005, Viz Studio 2005 are now released and BizTalk 2004 2006 is launched (sic). Go to the good old MS beta site and you can get the RTM compatible CTP download of BTS 2006.
So is the wait worth it? Well most cetainly for both SQL 2005 and Viz Studio. BTS 2006 is a point release but still offers some goodies.
SQL has now become a grown up ETL product and add some cute 'integration features'. Viz Studio has just built on itsd already excellent code base.