The recently announced updates to the existing Armada Wars Kindle eBook titles are all live.
The Ravening Deep has a minor plot-based correction, and quite a few tweaks for readability. Definitely worth getting! And if you own the Books 1–3 Omnibus, that volume contains the same changes.
Steal from the Devil and List of the Dead just have a few corrected typos and some cosmetic tweaks.
If your Kindle account doesn't have automatic updates turned on, details on how to obtain the updates can be found in the last section of the FAQ page.