However, if you currently have an embed and would like to take advantage of the new system, you will need to upgrade your embed code. The easiest way is to load your map and then use the get widget code, alternatively you could do it manually, the new embed code looks like this:
<iframe width="550px" height="400px" src="http://widgets.scribblemaps.com/widget.html?id=mymapid&d=true&mt=false&z=true&l=false&p=true" frameborder="0" style="border: none; margin: 0; padding: 0"></iframe>
where mymapid is replace with your own mapID. Just like the old widget, this widget also has support for rendering KML directly by setting the kml parameter.
We are very excited about this, and look forward to more of your creations.