If you're looking for the auto-brightness switch on the Android L preview build, you won't find it. That's because it's been replaced with the adaptive brightness toggle, shown below.

Screenshot_2014-06-26-19-18-11 Screenshot_2014-06-26-19-18-22

If you're familiar with iOS, you'll know this is how Apple has been doing things in regard to brightness for a while now, and many users prefer it. Samsung and LG, too, have shipped phones with adaptive auto-brightness in the past, though both seem to have shied away from it on US models of their phones in recent years.

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