Some early reports of what the Iran deal might look like
Iran Would Eliminate Stock of Its Most Highly Enriched Uranium Under Deal

Iran would be allowed to continue to enrich uranium at much lower levels, to 3.5 percent, the officials said, but would also agree to cap its current stockpile of such uranium, by eliminating, diluting or transforming into fuel as much 3.5 percent uranium as it produces over the six months.
…
Western officials said Iran was also being asked to halt construction, for six months, on the Arak heavy-water reactor. The reactor, when finished and fueled, could produce plutonium, another route to a nuclear weapon.

Iran would also agree not to install any more of its faster, second-generation centrifuges, the machines used to enrich uranium, and would not operate the 1,000 or so of these centrifuges already installed but not yet in use. Iran would also agree to more intrusive inspections, to ensure the deal is kept.