This is one of most missed features in Plastic.
I need to know when a particular version arrives in a specific branch.
It is often not important, when it was changed originally, but is vital to know if that very change is part of a given release changeset.
And sorry - pointing to the 2d graph is not a solution. It is "PITA" to follow dozends of merges until to find if the merges might have hit my branch or not.