Palm Boulevard reports that Sony has posted a statement on their Japanese Web site that mentions an OS 4 upgrade for the N700C. The statement is on the Japanese Web site so there is no mention of an upgrade for the Sony N7100C. The biggest advantage that will come with an OS 4 upgrade is 16-bit color. The hardware built into the N series is designed to be capable of 16-bit color, but Palm OS 3.5 has a limitation of 8-bit color. The upgrade is expected to be released before the end of the year and will cost 10000 yen ($82).