Appeon 6.6 has been released on May 16 2013.  It supports MySQL and SAP Hana database, Amazon, Azure, and Rackspace cloud.  It supports IE 10 (without using the compatibility mode that is required if using Appeon 6.5.1), and the Appeon Web debugger works with IE 9 or 10 (instead of only IE 8 as in Appeon 6.5.1).

Appeon 7.0 will be released by the end of 2014 and it will support cross-browser on Windows OS.  It will also  support more modern UI.  But a browser plug-in will still be required.