The majority of these replies are hugely inaccurate.
To begin, BigFix was never Fusion!! It was created and developed by the BigFix company in the late 90s, and grew significantly in the 00's to become a leading systems management and patching solution. IBM bought it in 2008 and did very well out of it, however in the past couple of years it received less investment as IBM's focus turned to other newer and flashier security products - QRadar, Resilient, X-Force, IAM etc.
To fund IBM's acquisition of RedHat they needed cash, and HCL wanting to start a fully fledged software business and with cash to burn decided to acquire some of IBM portfolio that HCL was already developing on behalf of IBM under an IP partnership. We are talking extremely profitable products, with $billions worth of annual revenue.
However as part of the deal HCL wanted BigFix and AppScan. IBM with their hands somewhat tied in the midst of the RedHat acquisition decided to let these products go with the the domino and collaboration products they were already selling.
For BigFix it's great news - HCL are investing heavily into it's dev+support and it will be a major pillar in HCL's new software business.
I expect IBM to be launching a pretty aggressive redundancy program soon. With their focus squarely on Cloud, many existing business lines will not be part of their strategy going forward.