Is continuous focus a 4.0-only feature?

The http://www.android.com/about/ice-cream-sandwich/ page details that Android 4.0 "Ice Cream Sandwich" introduced two interesting features for Camera: **"continuous focus"** and **"zero shutter lag exposure"**. Have both of these features been removed or disabled post 4.0? My Galaxy Nexus seems to have neither since the 4.1 and 4.2 over-the-air upgrades. Holding a 4.2 Galaxy Nexus still and taking a picture with auto settings and without flash in a relatively-very-well-lit nightclub takes about 3 seconds, and taking another picture right away takes another 3 seconds, seemingly indicating that both features are completely absent in stock 4.2.