Unless something unexpected happens, $7 billion of Iran's frozen assets will be released soon. According to reports, there is agreement that Iran will release three citizens with Iranian-American citizenship after being convicted of espionage. The indictments are fabricated but Iran has used them as bargaining chips and seems to have succeeded.
 
The funds released will come in part from South Korea. They will be transferred to the Central Bank of Oman. The Omani foreign minister was due to arrive in Tehran today to finally close the deal but the visit was postponed to another date. 

This deal is not directly related to the negotiations on the nuclear agreement in Vienna.