We can only speculate that this was done to protect the Guccifer 2.0 DNC leak and the leak of Hillary's emails that Julian Assange has been quoted saying will be "enough evidence to criminally indict her."

Can we expect these leaks to be on the 4th anniversary of Julian Assange's illegal detainment inside the Ecuador Embassy? Which Assange won a case earlier this year at a UN panel in February, where his detainment was ruled to be arbitrary detention. Its been four long years, since Assange has been stuck in the Embassy, fearing the consequences if he leaves being his arrest.

One can only hope the release is on Julian's anniversary in either case these leaks are coming.
It's however interesting to note that the last time Wikileaks released an Insurance file it was to protect it's founder Julian Assange.