The talks go on, but there's cause for cautious optimism. CNN: Diplomats and negotiators worked late as an initial deadline approached, but more time appeared necessary to reach a framework deal. How long talks will continue was unclear. French Foreign Minister Laurent Fabius informed the Iranians that he will return to Paris at dawn Wednesday in an apparent effort to force the Iranians' hand, Western diplomatic sources told CNN. Hamid Ba'idinejad from Iran's Foreign Ministry said earlier Tuesday there are no "artificial" deadlines and a deal will be reached, when each issue has been resolved. Diplomats told CNN that there has been progress, but gaps remain. For Iran, that means there's a light at the end of the tunnel for crippling sanctions.