Thanks to Voodoo @ Neowin for the update on this:
DirectX9 beta testers have noticed that Microsoft are gearing up for a new DX Beta, when they saw that DX9SDK has been added to their contact info at http://www.betaplace.com. It was speculated this maybe DX9.1 SDK beta (as Neowin has previously reported), but it could also be a small update. We will keep you posted on any additional info we receive. DirectX9 SDK Release 2 Soon?