CPU yes, but what about storage
Although the author's assertion that running on existing hardware will lower cost of big-data analytics, a key point of "Big Data" is not CPU-load, it is "you have lots of low value data to work with". Platform doesn't address that story; they may have better scheduling than Apache Hadoop's out the box schedulers, but their storage story is the same: run HDFS for location-aware storage.
No doubt IBM's story will become that of IBM's grid story: use GPFS, but that increases the cost of storage in exchange for location-independence, which limits the amount of data you can retain.