First/Last Array Modifier Object Offset
Right now, the array modifier's object offset lets you use an object to define the relative transformation of the first duplicate, and then extrapolates the transformations of further duplicates. This feature would allow you to also use an object to specify the relative transformation of the last duplicate instead of the first, then mix the transformations for duplicates between them.
2 Comments
It will be helpful in some cases.
You can use duplifaces to achieve the effect. If you do not want to position the faces individually, but want a smooth interpolation, you can use curve deform for that.