DHTML field sets for f:form - supports token generation. Plus 90 ViewHelpers for interacting with the PageRenderer. In Git now, on TER very soon.
Two new groups of ViewHelpers have been added - DHTML form field groups and PageRenderer interaction. The DHTML form field group ViewHelper suite allows a group of fields to be repeated and and pre-render a number of fields with existing values. The ViewHelpers can be used to let the user choose how many groups should be rendered and then fill in the groups.
See a full list of PageRenderer ViewHelpers and a bit of documentation at
On a side note, FED now contains exactly 254 ViewHelpers. Okay, some of them are aliases for other ViewHelpers. Some of these will be depracted and replaced by PageRenderer ViewHelpers which provide the same functionality.