Capitan Games have posted details of a War of 1812 for their Capitan Napoleonic rules.
From their announcement:
After the release of Capitan 1813 – 1814, we are working in a new supplement for our Capitan rules. War of 1812 will include units to re-fight the war between the Americans and British in America. As Stuart Asquith says this war was a “Napoleonics with difference” or ” Napoleonics with Indians”.
Now we are in the process of select what units we will include in the supplement so any suggestions are welcome, please send a mail to us at email@example.com