Will buy its way into the hyper-converged systems space?
No!
The future of IBM storage is Software-defined
IBM Spectrum Accelerate; a VMware deployable image that turns internal HDDs/JBODs and Flash Cards into a storage cluster where capacity is made available to any VM host via vSphere or OpenStack (Cinder) over iSCSI.
IBM Spectrum Scale; an installable driver (not VM image) transforming local HDDs, Flash PCI cards and RAM cache into a distributed storage continuum with global consistency, able to sustain data rates of 2k files/sec or 30Gb/sec and above. In contrast to hyper-converged appliances shows that only 3-5% of clustered servers should have local disks, yielding the optimum balance of access density versus metadata traffic.
IBM Elastic Storage Server; (Spectrum Scale-in-a-box); high-speed n+2 or n+3 erasure code data protection for JBOD, defined by policies and based on POWER8 architecture running Linux.
Obviously IBM will maintain DS8K for the mainframe, as it continues to develop and enhance it's mid-range Storwize family that formulate not only it's own converged system offering in PurePower, but also the converged system offerings of it's partner's Cisco (VersaStack) and Lenovo (Flex Systems), whilst exploiting the growing flash storage market they bought into acquiring TMS to create FlashSystems.
They did not exit the x86 server business only to re-enter it because of flash-in-the-pan technology.