Quicksilver Software posted the following statement on the official MoO3 forums:
Yes, work is in progress on a patch. We have no delivery date at this time.
We are concentrating on the Military AI (offensive, defensive and build queue) and point defense problems, along with some UI glitches and any crash or easy to fix bugs. Changes which require any artwork are extremely unlikely for this patch.
The plan is to release a data-only patch fairly quickly which should help with some of the Military AI problems (and other things) and may also contain some additional documentation on use of the spreadsheets to help the modders.
This will be followed by a code patch. Code changes will be listed here as they are verified internally, so that you know what is coming.
The actual release of the patches will be controlled by the QA departments at Infogrames (for Windows) and Destineer (for Macintosh).
We are happy to hear constructive feedback from fans regarding bugs of design issues and have been listening to feedback from a number of fans, both off and on the boards.
The only crash bug that we have encountered internally since ship involved processing a "Demand Gift" message when the receiving empire's GDP is 0. The diplomatic hit is based on the value of the demand divided by the GDP. When the GDP is 0, this crashes on the PC with a divide by zero. This is fixed in the first code patch.