The Heart of the Swarm beta is about to get a levelling system according to a new post on Battle.net post . Players will be able to level up each race separately to unlock extra portraits and decals. Building units and decimating enemy troops will contribute small doses of XP to a grand match total every time you play. "Build up powerful armies, wreak havoc on the map, fight to the bitter end, and you'll be rewarded for your efforts," say Blizzard.
"We're already working on concepts like “bonus XP for your first win of the day” and “extra XP when you play in a party with a Battletag or Real-ID friend”," they add. "We're considering “bonus XP weekends” and other sorts of activities, which will be tested in the beta."
Every ding on the way to the level 20 cap will unlock a new portrait or decal, and your cumulative level will be visible "right next to your player portrait" for bragging rights. I can imagine getting a bit obsessive about taking out enemy units for XP, it's a shame that decals and portraits are the only rewards. How about some alternative UI skins, or some unlockable /dance animations? I want to see a Marauder do the robot!