The empty space to the left of grid and my UF's is where my totems and other trackers appear. Right above the ToT (which is the the UF above the AB's) is where my casting bar appears and my target's as well (I have eepanel's parented to them). Lastly, the chat frame is in a dock so when I middled click the black portion right below the text it goes into a tabbed mode in the bottom left corner of the screen. The rune in the center only appears when the haste procc's of the scarab of infinite cycle, and I also have a smaller one when I get the spellsurge procc.
By the way, if you noticed the whisper from laxx in the chat log, just go with it. I think everyone knows a "laxx" ingame who just likes to send random tells like that. The funny part is how he can MT, call out stuff, tell a story in vent, and send those tells out all at once lol.