It is in the commit-details widget now. On the left side next to the file filter edit box, there is a icon-button (looks like a document). If you click it, you will get the manifest of the selected version.
Unfortunately it is not so easy to get to the manifest of the working copy, though, because that button doesn't show up in the status widget, which gets automatically selected if you click the working copy in the graph view. However, you can still get it by means of pressing the toolbar button for revision details, which will switch your status widget to commit-details again, but now for the working copy.