The Tech Report reports the Radeon X1900 GT will feature dongle-less CrossFire:
French site PC INpact says it heard straight from ATI (translate here) that the upcoming Catalyst 6.6 release will allow Radeon X1900 GT graphics cards to work in CrossFire mode without a dongle or a "master card." This change could make the X1900 GT much more attractive choice for dual-GPU systems. ATI's Radeon X1900 CrossFire Edition master card is currently priced at a whopping $499.99 in our price search engine, while the X1900 GT can be had for just $269.99. If PC INpact's report holds up, users will be able to build a Radeon X1900 GT CrossFire setup for $540 instead of $770 once the new Catalyst drivers roll out.