Yes, the plan is to support other browsers in future releases. To do so, we'll move the xsl transformations to the server and have a java servlet handle the work. I can't make a promise on the exact date but it should be soon since I need this for work as well. I have an application that I want to use the webview code with but we have Macintosh users that cannot do client-side xml/xslt transformations. Hopefully you'll see this within the next month or two.
Jack