After a particularly successful game of Overwatch I went to watch my highlight of the match since I enjoy inflating my ego like a bouncy castle. After having done that I went back to the main menu and glimpsed rapidly changing characters at the bottom left of the screen. (See below)
This set of characters appeared every time I went to highlights and back to the main menu but not for any other menu option. However, upon restarting the game it no longer appeared. The last number that is changing appears to go from around 4000 to 0 and then repeats once before the characters disappear.
What are these characters? Is it a hidden message? Is it just loading something?