If you've run into the problem where you're running out of space on your Exadata system, relief is on the way. Oracle has announced the Exadata Storage Expansion Rack. It comes in 3 handy sizes, just like your Exadata: Quarter, Half, and Full. They've taken out the database servers and left the remaining guts inside (KVM, Cisco switch, 3 IB switches for half and full, 2 IB switches for quarter).
The quarter rack has 4 cells, a half has 9, and the full rack includes 18 storage cells. All come with the "High Capacity" 2TB 7200RPM SAS drives, meaning the full rack comes with 194TB of usable space. The best thing about this is that you'll be able to add the storage to your existing Exadata without taking anything offline. Just connect the new Exadata storage to the spine switch on your existing Exadata, and you're ready to configure the cells and add the griddisks to ASM.
While checking the pricelist, I also noticed the inclusion of the Exadata memory expansion kit. This will allow you to upgrade the RAM on your X2-2 database servers from 96GB to the maximum of 144GB. No word on whether this has been officially announced yet.