Can you provide more information about the type of symbol and type of animation you would like?
We are researching animated symbols for our roadmap, but it is already possible to achieve some "animation" today depending on the effect you want.
What I want to achieve is such an effect, if an emergency occurs in a place,then this place will have an outward propagation effect like seismic waves on the map.
Now, the question is is the flag cannot move when I move my map(my map is arcgis map).
But if I use Bing Map and <map:Pushpin> element, the flag can move when Bing Map moved.
This sounds like it is worthwhile creating a separate question.