New Observer Mode in StarCraft II

In Observer mode menu located at left top corner. If you clicked this, you will see 7 menus, None, Resource, Spending, Units, Production, Army, and APM.

Resouce - You can check player's mineral, gas, and number of units.

Spending - has 3 other sub catagories, Economy, Technology, and Army.

Units - Show how many units player's have

Production - Show buildings and units player is producing

Army - How many resouces did player used for units he produced.

APM - Action Per Minutes, show how fast this player can do.