According to the official website, the TV airing and the online streaming of Mahou Shoujo Madoka★Magica
were announced to be suspended for an indefinite period. The releases of the Blu-ray and the DVD were postponed for one month. The fifth volume will be released on August 24th, but the release date of the sixth volume, which contains the episodes 11 and 12, hasn't been announced yet.
According to the official twitter, the producers will keep on working hard to air the remaining two episodes by the end of April.
posted on his twitter that he was sorry for betraying people's anticipation, which was originated from Urobuchi's optimistic comments. He said it had been so painful for these ten days that he couldn't stand without believing a good outcome.
Sources: Madoka Magica official website
, Urobuchi's twitter
, Madoka official twitter