ARIN announced a new report (Waiting List for Unmet Requests) on its website showing its waiting list for IPv4 address space. As of Aug 24, 2015, the list has already grown to almost a /12 worth of IPv4 address space in just 7 weeks since the first organization was put on the list July 1st, 2015. Today, there are 56 organizations with requests on the wait list. The average size is about a /19, with the largest request(s) being a /16.
While some of these requests will be filled with space from the IANA recovered address pool, some requests will not be met with the next allocation. IANA is slated to issue its next block of addresses to each RIR on September 1st, 2015. According to the published code IANA will issue a /14 equivalent to each of the RIRs.