Those who follow such things seem to think that the framework agreement on Iran's nuclear program is more detailed than was expected, which raises the chances that the remaining details can be resolved between now and June. I can't say the details are all that crucial for me, since I think the dangers of Iran's nuclear program have been considerably exaggerated, but they are crucial for some people, including the parties to the talks.
If a successful conclusion is reached in June and if Congress can be kept from mucking up the works, it will be a clear triumph for all the parties. Among other things it will be a foreign policy win for the Obama admin, whose foreign policy record to date has been very mixed (at best). But I would be wary of concluding that the path would then be open for quick normalization of U.S.-Iran relations. Normalization of U.S.-Cuba relations, which has been out of the headlines for a while now, is presumably going to be a fairly long process, and I see no reason to assume that the future course of Iran-U.S. relations will be different in that respect.