It's back on, apparently just an admin balls-up. Here's the statement from the Superintendência de Desportos do Estado do Rio de Janeiro:
"The judge on duty at the Court of Rio de Janeiro revoked the injunction suspending the game'''''''' Brazil vs England, Day 2/6, in Maracanã, by action of the State Government with the presentation of the report the PM that proves compliance with all safety rules at the Maracana. The report had not been delivered to Suderj by * fail * bureaucratic.
The match between Brazil and England is confirmed to the day 2/6 with full safety conditions attested."