I went ahead and emphasized the important part there. Your impressions are pure speculation, and you're not even basing it on information that's been provided. The developers haven't said anything, but based on the guilds available, it's a safe bet that thieving and assassination will be part of the game. At least it's a much safer bet than the totally made-up notion that stealing will be impossible.
And saying we can steal is also speculation. Most everything that people here say is, in some shape or for, speculation based on the info they have provided. Everything.
My "speculation" is based on what the developers have said. I read the entire GI article, and my impression was that stealing as TES fans expect it wont be in the game. Your impression may differ, and is based ON THE SAME THING I got my impression from. They have stated they can't implement many things due to the format of MMOs and expectations of TES/MMO players. Stealing could very well be one of those things, as stealing is a very complex issue that requires quite a lot of work to balance and implement. Is my impression unfounded? Objectively, no, it is not.
I may be right, I may be wrong. We don't have much info, so we take what we have and, you know, speculate, guess, listen to our gut, and examine what devs have said, etc... Time will tell. Leave it at that.