Well, we all know what kind of games ID makes, they have been doing it since Wolf3D, and i forsee no change on the horizon.
You can tell what kind of games you can expect just by looking at the name gaming co. choose for themselves- its a summary of their view of how games should be (which may differ from your own) and you cant expect changes unless all the staff management has been replaced.
Take id- I guess it comes from the freudian term, which stands for the part of the human psyche that has no form, is not governed by logic and can be viewd as a bubbling mass of energies that demands an immediate satisfaction. Hence id's games has no stories, no time-space relation between levels and are basically kill kill kill (find key) kill games.
Now take Valve as another example- as long as Gabe Newell is in charge youll bet your life theyll continue on making linear and heavily scripted titles. Just look at the name- a valve, any kind that I know of, is used to regulate flows inside confined, linear sets of pipes (blood vessels, steam pipes etc.) same way as Valve regulates the drama/ tension/ action in their games by scripted events in a confined and linear levels- helps to maintain the story solid and keep the player in a roller coaster of peaks and breathers.
TTLG always strived to create rich, believable, albeit distorted, worlds, not unlike that Lewis Carroll's book they were named after.
Tripwire- goes without saying.
Edit: On a side note- rumor is that Rage
will have a story and thats a big change for a company whose head was once quoated saying that a story for a game is as unnecessary as a story for a porn flick.
I guess id is keeping up with the winds of change despite their philosophy. (and ye, I know the story will be cheesy)