For those of you wondering, yes, you can still enable an actual app drawer icon on the launcher as well within the settings menu. (9to5google.com)
Whether you try to add more pages to your dock or just a custom app drawer icon, we hope these tips can make your dock more vibrant and more versatile. (androidcentral.com)
The video below shows the swiping gesture for the app drawer, but it also shows the traditional app drawer icon. (slashgear.com)