"You could make an argument that Intel has to re-enter the memory market to justify the ever-increase costs of its fabs, El Reg supposes. It is not that much of a leap from flash to DRAM"
Of course you can’t make that argument it is ridiculous.
Intel will use the TSV to put eDRAM on their logic chips exactly as described for IBM in your article. Unless you have lived under a rock Intel have stated there desire to make SOC's for smartphones etc.. These will need to be stacked with RAM to keep PCB footprint low for their customers.