These four drives showed up on Lite-On IT's global website
DH-20A3L - Serial ATA and LightScribe
DH-20A3H - LightScribe
DH-20A3S - Serial ATA
DH-20A3P
These drives were supposed to support DVD-RW DL but it doesn't look like that make it into the feature list. Without it, they really don't offer much more than their current 20x drives.
According to the info I have, these drives use MediaTek's MT1859 chipset and Hitachi 353L OPU.