Here what Zacks had published:
"... CEMIG disclosed that this dividend will be disbursed in two installments to shareholders of record as on Jun 27, 2014. The first installment of approximately R$0.87 per share will be paid by Jul 8, while the second installment of roughly R$0.48 per share will be distributed by Sep 30 ...".
I posted on another thread, but through further discovery found that I wasn't entirely correct.
There is a 40.246 cent regular dividend to be paid on about the 8th, went exdividend in May. Will have a 2 cent ADR fee taken out.
The 61.188 cent special dividend actually has two exdividend dates which makes it screwy. The Brazil exdividend date was in June. The ADR exdividend date (the one we care about I guess) is apparently July 8th, and the payment date is still a bit vague (I was wrong on the July 8th date). As such, expect about a 60 cent drop in the price soon.