In Gnome 2, when an application was fullscreen, Control + Alt + Tab would let you select either the top bar or the bottom bar (AFAIK, they are also called "panels"). In Gnome 3, the same keyboard shortcut lets you select only the bottom bar. How can you show the top bar?
EDIT: I am experiencing the same problem with Gnome Classic.
EDIT2: The problem is that when applications go fullscreen, they cover both panels, and I can only make Gnome show the bottom one.
EDIT3: I have found that both Super and Super+S enter the Overview, thus showing the top bar in Gnome Shell.