Hi,
Here it is, Google released VP8 codec open-source, with a Web container format based on Matroska: WebM
http://www.webmproject.org/" onclick="window.open(this.href);return false;
So feature request for TVPaint: import/export .webm files (and I guess theorically VP8 codec will can be used in .ogv and .avi as well in the future, right ?!)