Attached is the video of the Secret Wars announcement for those who missed it.
There are some pretty big bombshells in the event. In particular the wars will be between the Main 616 Universe and Ultimates Universe. The winner will continue to the exist and all other universe will cease to exist.
Apparently, the story has been building toward this for many years.
Comment from Alonso:
We have never done any this big ever
We have had to be cognizant of Secret Wars for all other Marvel Events.
Secret Wars - Observation Deck see the battles unfold here!Secret Wars - Promos