I think they lent Obsidian a hand on this one though
Our producer here, Jason Bergman, was actually on hand for all of the VO recordings. You can read about Jason's role http://bethblog.com/index.php/2010/04/21/inside-the-vault-jason-bergman/.
Unless I've missed something basic, the companions are not playable. Playable would mean that you could control them instead of your own character. As far as I know you can only give them orders through the companion wheel. What a misleading article.
Yes, you're correct. Slight slip up in the article.
I hope that Wes Johnson is doing VA workin New Vegas. Sure, he's not really a big name and is more of a Bethesda dude, but you can't deny that he's got talent. I loved him as Mr Burke.
You should hear him at a Washington Capitals game... he's amazing.