From his blog:
So what’s going to happen to Winternals and Sysinternals? Microsoft is still evaluating the best way to leverage the many different technologies that have been developed by Winternals. Some will find their ways into existing Microsoft products or Windows itself and others will continue on as Microsoft-branded products. As for Sysinternals, the site will remain for the time being while Microsoft determines the best way to integrate it into its own community efforts, and the tools will continue to be free to download.A smart move, but as marypcb said: it's taken them long enough.