In the latest version of blender 2.8 I can not find the button for an object that allows it to be shown in the rendered image. There is only one 'eye' icon left, which makes the object invisible/visible in the viewport.
Render Icon it's hidden by default
You have to enable it from the Filter sub-menu.
Look for the camera icon in the Restriction Toggles section.
It has been hidden by default in order to tide up things a bit.
As you can see, now there are many possible controls you can enable/disable for the outliner, so they decided it was better to give the user the choice to costumize the right column.
You can see Pablo discussing this aspect in one of the Blender today videos: