The three dots will come up in the bottom right corner when an older app still needs it. Overflow actions are being moved to the actionbar for devices without a hardware menu button. I recommend getting used to apps having the button on the action bar. It makes it much easier to know when there are available overflow options.
Sent from my Nexus 7 2013 using xda premium
Current: Galaxy Nexus LTE - CM10.1 Nightly (jellybro)
Extra (previous): Droid Incredible AMOLED - CM7.2
Father: HTC Rezound - Stock Rooted