The 9-series chipset supports the current AM3 socket and the upcoming AM3+ CPUs (based on the Bulldozer architecture). Although, the new processor design is yet to be released in the market, AMD released the new chipset anyway. Some manufacturers already handed out their new motherboards which carry this new chipset such as ASUS, Gigabyte, MSI and ECS. The great thing about it is that you can still use your Phenom II, Athlon II or any AM3 processor on this motherboard and reserve it for upgrade options when the Bulldozer CPU comes out in the next couple of months.
The AMD 9-series comes in different models and these are: AMD 990FX, AMD 990X and AMD 970. The demand for the motherboard which carry these chipsets will probably increase when the Bulldozer processors come into play in the following two months.