I'm having some issues with the new Heatmaps:
The provided sample does not work in chrome:
Try panning, zooming, the heatmap will shortly move with the map, but when it upates, it just flips back to the initial state.
Width/height won't be set
In my own code, I'm adding a Featurelayer using a featurecollection object instead of a REST url. but for some reason, the width and height of the layer will not be set, so it stays invisible with a 0/0 size.
In my own code I avoided the above by setting width/height to 100%, but even in Firefox when I zoom in or pan, the heatmap either disappears or does not update.
The code I use to add the layer looks like this: Perl Nopaste