Just had this email from Humax support. It does confirm that they intend to issue at least one more software release for the 4000T.
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"Hi Kevin,
Thank you for contacting Humax. Unfortunately we have been very busy lately which has caused a delay in our email response time, I apologize for any inconvenience this caused you.
No we will continue to provide updates for the FVP-4000T, while we do not have a release date at the moment there is an update due to be released in the near future.
Best Regards,
JosephM
Humax Customer Support"