I think the concern is that the HDSDI taps going to video village may not have framelines. It'd be nice to add framelines [or simply black out everything but the selected output area] to that output rather than having to tape over the monitor. This would obviously have to be something that one could turn off because of the folks who may record HDSDI output.
As for the EVF/LCD, I'd hope that all the gadgets could be pulled up onscreen whenever the user decides to see them - be it the subject with overscan and framelines, no overscan, no framelines, focus assist, waveform, histogram, camera status ["footage" count], etc. All the toys. ;)
For example: the EVF could display just the subject, overscan and customized framelines but the AC could have both the subject and focus assist pulled up on the LCD. At a moment's notice they could click over to the waveform/histogram and camera status displays. Meanwhile, over at video village via HDSDI or HDMI, the director could be seeing just the HD output with framelines and a LUT.