Add $position option which takes a positive number.
db.col.save({_id:1, a: [3]})
db.col.update({}, {$push: {a: {$each:[1,2], $position:0 }}}) // pushes to front of array
If $position is equal to or greater than the array size then it will be ignored and is effectively a push to the end, which is the default behavior if not specified.
This will allow you to effectively $pop from the top and add to the bottom or vice versa using $slice since you push in either direction.
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SERVER-2362 Add new Deque/Set operation modifiers
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SERVER-6399 Refactor update() code
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