A source emailed the site telling them, “....Warner Bros want another 'Inception' - as in sequel. Doesn’t make a lick of sense creatively, but financially? well… it made ”a lot” of money for them. Can’t imagine [Christopher] Nolan wanting to do a sequel, let alone direct one. Also don’t imagine Jeff [Robinov, President of Warner Bros.] would want to piss off Nolan by doing one around him. All interest is on the studio side at this stage. We shall see comrade…”
"All interest is on the studio side" should be a pretty clear indication of Nolan's thoughts on the project. Any studio would want to follow up their biggest hit of the year with a sequel, but Nolan is no ordinary director. He's likely exercised the territory he wanted to explore in the film and we would imagine after "Batman 3" he'll have another original project he'll want to tackle instead. But we would wager Warner Bros. will keep popping up the suggestion now and again, so don't expect this to be the last you hear of it. As for us, we have no interest in a sequel. A prequel, showing how Cobb got deported/exiled from the United States could be interesting we suppose, but again, not a movie we're eager to see. We'd rather see something new from Nolan's mind instead.