Just found these, but obviously take everything with a grain of salt until the official announcement. Doesn't mean we can't still speculate!
ATI Radeon HD 5830 Video Card Specs & Pictures Leak Out
ATI Radeon HD 5830 leaked, detailed and priced
ATI Radeon HD 5830 leaked (bigger chart)
ATI Radeon HD 5830 Video Card Specs & Pictures Leak Out
ATI Radeon HD 5830 leaked, detailed and priced
ATI Radeon HD 5830 leaked (bigger chart)