You are missing the point
At this point in time NAND cache integration and 2-tier storage integration into a plain OS server requires more than drivers. You need specialized software to make really good use of it.
This is a 3 player game, not a 2 player game. In fact, it is probably more important which flash supplier gets promptly in bed with CA, BMC and their like here and not the server vendor. The only server vendors capable of playings both sides here are HP and SnOracle.
This is likely to be the case for at least 2-3 more years until MSFT and Linux pick up the slack and make this a properly working standard feature in their base OS-es (by the way - MSFT current implementation is anything but that). Only then, it will become a OEM-Server supplier game and even in that case there may be some space for the 3rd party. Until then Dell will grind its teeth and will most likely still ship the PCIe flash as "Fusion IO, Storage Vendor X certified".