Animated tiles/sprites can be easily added with a layer above your tilemap with separate animation atlases and all the features. Guess tilemap in a current version is too far from having all the functions the overall engine has. Judging by how tilemap addresses tilesource, I think adding animations might take a serious conversion.
Plus with the next update there should be a sprite trimming… not sure if it should be a top priority, but definitely crucial feature for a 2D engine too. =)
PS And tilemap definitely needs some kind of tilemap.clear(tilemap, layer) feature. =)