Well i demo-ed the pre production unit and wasn't really impressed with it, especially im comparison with the DX90. But I must say the unit was faulty and was not able to read my sd card, so I cpuldnt test with tracks that I am comfortable with. Also, I was told the production unit might be tuned further, so lets see how it goes!
It means I would not be the first few to jump the boat however, until I demo the production unit at least.
it reads FAT32 and NTFS formatted sd card. your card could be in exFAT format which can be read by DX90