Rock Paper Shotgun reports that a free version of StarCraft 2 will be available later this month:

StarCraft 2 launching generous free version this month

A huge chunk of StarCraft II is going free later this month as a sort of big ‘ol demo for the wider trilogy. From November 14th, everyone will be able to play the full Terran story campaign from the original Wings of Liberty, the competitive multiplayer including units from all three chapters, and — with some limitations — the cooperative mode too. If you dig it, you’ll be able to buy the other bits of SC2 separately or in one big lump.

Oh, and people who own Wings of Liberty but skipped Heart of the Swarm will be able to get that Zergy instalment free – if they claim it in time.

So! Free SC2, eh? Yup, Blizzard are turning the heart of it free, with one of the three big story campaigns, all the competitive multiplayer, and most of the co-op. There are, of course, restrictions.

[...]

Thanks henriquejr!