Just two minor corrections.
1- It can support up to 247 PB of storage (but who's quibbling over a few PBs eh?).
2- Currently only 146 GB 15k rpm 2.5" drives are available. Higher capacity 2.5" drives are 10k rpm. Hopefully vendors will announce higher-spinning drives.
I may be wrong, but I thought EMC has not launched FAST v2 yet? What HDT (Dynamic Tiering) does now (block-based automated tiering)?
AC - well.....