These price cuts are mirroring intels price cuts.
Both 920 and 940 modeles will be soon eol(Q2 iirc) and AMD will introduce 2 more models(top of the line,945,950) and replace 920 with 925(DDR2&DDR3 support).There will be also a whole gamma of quads with less L3/no L3,tri cores and duals,so AMD practically covered all market segments except the uber high end(which they may cover with dual socket boards for desktop or six core FX part in Q4).
AM3 will be basically the only lineup in Q3 ,while AM2+ 9xxx/9xx series will be eol.