So far from what we know, there will be a large variety of companions (more than what one would expect in a BioWare game). At the same time, these companions will be less in-depth in terms of content, but should still play an important role in the game.
Do you really want to see companions in Skyrim? Do you believe it is something BGS should focus on and that it could contribute to the series? If so, what ideas do you have in mind that would make them more viable?
Companions were completely useless and frustrating in Oblivion. Companions in Fallout 3 were decent, and at least added some support in tough situations.
I personally would obviously like to see improvements in companion survivability. I would also hope that the Radiant AI would help companions become smarter and use their strengths to their advantage (whether they are a mage, a thief, or a warrior). If there are a wide variety of companions, I also wouldn't mind them actually dying, instead of just becoming unconscious. Also having more control over what a companion does and whether to engage or not would be nice.