I understand what bob1xxx and GhostHawk are saying.
For regular software, extensive testing is needed, because there is a mind-boggling variety of ways a PC is configured (different OS version, drivers, etc). However, for a product with fixed configurations (eg jBook, PSP, MP3 players etc), I suspect a lower amount of 'testing' may be required. I would venture that it is the priority the company places for a product that determines the frequency of updates.
In ectaco's forum, the support team has indicated that jBook Lite will have an update in April. They seem to have forgotten about jBook regular.
Anyway I'm fine with the current firmware. But there are issues that I hope a new update would address.