The latest round of nuclear negotiations between the P5+1 (United States, Russia, China, the UK, France, and Germany) and Iran came to a close on June 20th with no evidence of an imminent final deal or notice of a potential extension of the JPOA's suspension of sanctions before the JPOA's expiration on July 20th.
A final round of talks began on July 2nd and is scheduled to run until the 15th; a marathon session signaling that both sides remain motivated to reach an accord over Iran's nuclear program and a roll-back of economic sanctions. There have been no formal statements from either side about extending the JPOA period to give negotiators more time.
Public reporting indicates that the key stumbling block to an agreement is how many centrifuges Iran will be allowed to maintain; the West seeks a number in the low thousands, while Tehran wants tens of thousands. Other issues are the design of the heavy-water reactor at Arak, the fate of the underground centrifuge site at Fordow, and the U.N.'s investigation into any possible military dimensions to Iran's nuclear program. Finally, there is disagreement on the length of any deal: the P5+1 group seeks 20 years, the Iranians only five.