Even if Audi does show a new B8 RS4 sometime next year after the B8 A4/S4 debut in Frankfurt, it will not be built until MY2010 at the earliest. And I would bet probably not 'til MY2011 or MY2012.
Any info about updates to the current B7 RS4 is pure BS.
2008 Interlagos Blue E93 M3 - M-DCT
2011 Salsa Red Jetta TDI Sportwagen - DSG