not too much support for the 590 chipsets anymore. some, but not much. my evga has absolutely NONE.
the 780a and 750a will be am2+ mobos, 780a with tri-sli support and 750a with regular (two card) sli support. plus, all the phenom support.
they are supposed to be launched relatively quickly now. NOTE: "supposed"
i personally wouldnt suggest a 590 or 570 mobo at this point unless you are in a pinch and just had to have one.
theres no way i would suggest a 590sli mobo when you can have an msi k9a2 platinum am2+ mobo for less money. still, it has crossfire support, but if you like ATI cards or only run one card, then it is supposed to be a great mobo.
the foxconn is a good board.