Blizzard has announced a new levelling mechanic via their battle.net blog
that will be featured in the upcoming beta update for StarCraft 2's next expansion, Heart of the Swarm. The update will allow players to progress through a new level system, rewarding those who do so with various items.
Our next major patch of the Heart of the Swarm beta is coming very soon, and with this update, beta players are going to be able to join us in testing a new feature for StarCraft II. Leveling introduces a progression system to the game that offers rewards to players of all skill levels.
The new levelling system will have a maximum level of 20 for each race, and upon gaining a new level a portrait or decal is rewarded. Currently the only way to win these rewards is through the achievement system with each new level rewarding a "more epic" item all the way up to level 20.
Players will be rewarded XP by defeating opponents, destroying and creating units and also for your efforts. Each race will have separate levelling meters, meaning players can dedicated to only one race or all three if desired. Rewards will also be unique to each race, and your overall level will be displayed on your portrait.
For those interested in leaving feedback you can do so in this dedicated thread
on the official forums. The patch has not been given a date yet, however "very soon" has been indicated.
Let us know your thoughts on this new levelling system by leaving a comment below.