Butterfly different versions with or without zener diode

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I got 2 pairs of AVR Butterflies from different sources. 2 from one lot have the zener diode for the voltage sensor installed as per the schematic, 2 from a different lot have this item missing.

Could someone who has the inside scoop from Atmel tell us if any new lots will have this diode installed or not ?

In fact, can someone from Atmel chime in about what the future plans for this item are ? I.e. continued availability, revisions, updates etc. I'm not asking for any updates or revisions, just wondering if it is safe to base any kind of product on this.