Take a look at this presentation by a key IBM marketing executive on the IBM Enterprise System. It appears that IBM is looking to consolidate its zSeries mainframes with its Power Systems line of machines into a new Integrated "Enterprise System". If you look at the reference presentation you will see that the system runs zOS, Linux, and Power OS's (meaning IBM i and AIX).
Note that IBM is looking to sell its xSeries Intel based server business to Lenovo and get out of the Intel server business.
Could the new server mean consolidating Power and zSeries into one new line of high-end servers? Note that this is one more nudge towards LINUX and the elimination of zOS, AIX, and IBM i proprietary OS's.
It doesn't take a psychic to read the tea leaves folks, IBM is consolidating its hardware and systems software operations, lowering costs and maximizing profitability. If your stuck on zOS or IBM i or even AIX you are in deep trouble and need to move rapidly away from IBM proprietary OS's.