Looks like they may be using these hammers as a good excuse to write a few crossovers for us to spend more money on. I was hoping this would be a proper (more cerebral) event which explores the fears of Cap and Thor and maybe just uses multiple mjolnirs as a plot device to exploit Thor's fears.
I surely hope its not the central premise.
Maybe they should sort out the dangling gungnir plotline first?
... more cerebral in that the fears of the characters will be explored and exploited by the NGOF (Norse God of Fear).
I was thinking that the hammers will be more of a plot device than the flux of the story. In that way it's similar to Blackest Night (powerful weapons are granted to the followers of the main villain).