I suspect some third party will make a replacement head (since it is attachable) with electronics. Shockwave lab does a lot of low cost led's for example. I would prefer a sound chip with unicron talking myself, but lights would be cool too I guess.
Still you can queue up some sound clips on an iPhone if there isn't a 3rd party electronics release, and it will almost be as good. I'm not going to let anything take away the shine of owning the planet killer Unicron