Re: Live Bokeh
" For cameras with mechanical shutters, the shape of this reflects the symmetry of the shutter - often hexagonal."
No, you're thinking of the flare from bright lights, which is usually polygonal due to the shape of the mutlibladed iris. The shutter doesn't come into it.
Bokeh is the 'pleasingness' of the out-of-focus parts of the image. The shape of the iris can affect this, as can the type of optical arrangement.