Google Glass' one-day only sale on April 15 seemed like a big hit but there was one issue left unresolved.

No final word yet on how many Glasses Google sold but an online post on Google said, "We're happy to see so many new faces (and frames) in the Explorer community. Just a quick update that -- ack -- we just sold out of Cotton, (a color of Google Glass) so things are moving really fast."

The Google Glasses were available for purchase on April 15 for $1,500, which came with a big software update that included the Andriod KitKat OS, the newest iteration of the Android OS  for mobile devices that allows longer battery life and easier updates.

The new software features included photo bundles, or groups of daily photos, videos and other material. Glass users, or "Explorers" as  Google calls them, also got to reply with photos in Google Hangouts and had their voice commands organized by frequency.

But the Google Glasses sold during the one-day sale weren't capable of making video calls for whatever reason. And the rumor mill is rife about the real reason for leaving out video.

"We hold ourselves to high standards for the features that we build, and video calls aren't living up to these standards," said the Google Glass team in blog post. The team noted that fewer than 10 percent of Glass users use the video calling feature. Video calls will return to Glass when "the experience is better," whatever that means.

Pundits, however, surmise that privacy concerns helped trigger the decision to remove the video function. That this could be the case bolstered by Google's request against improperly using Glass.

"Consider etiquette and common sense when taking video. For example, refrain from broadcasting events or content where such activity is prohibited (e.g. movie theater)," Google wrote on its help page for the Glass video.

Media reports said some of the early adopters reported angry confrontations over the video capability of Glass to secretly record and shoot images and instantly upload them to the Internet. This backlash could conceivably convince Google to delete the video capability on the mass market version of Glass due out on the market later this year.