There'll be "more videos or more comics" arriving too. Portal 2: Lab Rat is one such free comic bridging events between the original and the sequel.
"We will be announcing some DLC for it, so folks can keep a look out for more content coming this summer. We'll be putting more details out about that in a week or so," said Valve's Doug Lombardi. "We'll support that with more videos or more comics."
Lab Rat follows the exploits of the mysterious Rat Man who built little dens through a number of Aperture Science's test chambers for the player to stumble upon. Hopefully there'll be a big focus on more co-op puzzles to be solved, and hopefully not so many hats.
Day one DLC for Portal 2 was a collection of gestures, paint jobs, flags and hats but this angered PC gamers for their high prices. Valve discounted the entire bundle but that still sat just beneath £30. Metacritic was bombarded with low scores.