It's really incorrect to call it penta-level cells, since 5-level cells
do not store 5 bits of information! The actual amount you can pack into them would be log2( 5 ) which is about 2.322 bits per cell. In practice, it would be a little lower than that, because the packing is done on a block-level, and then you need to spend some bits on ECC.
There's a slide that makes it clear they're actually talking about 32-level cells, which are
truly 5-bit (before accounting for ECC overhead, etc).
The abbreviation should be P
BC (Penta-
Bit Cell).
Anyway, I'm hoping to buy something like their XL-Flash in a M.2 or PCIe card.