If you go for RAID, I would advise for software RAID rather than hardware (i.e provided by your motherboard or a physical car). Hardware RAID will lock you to the particular motherboard or RAID card, which would represent an additional hurdle when upgrading or replacing it.
It sure looks great, but I wished the trailer gave more information as to what we can expect feature-wise. The announcement blog post is pretty light on details (new graphics engine, laser scanned maps, improved physics and VR)