That's in the sense of 'several bug fixes', not 'several new features'

Hmmm... from the two above mentioned pages:

Formats

Formats were improved in several ways. A new field, ^*, can be used for variable-width, one-line-at-a-time text. Null characters are now handled correctly in picture lines. Using @# and ~~ together will now produce a compile-time error, as those format fields are incompatible. perlform has been improved, and miscellaneous bugs fixed.

and

Formats

In addition to bug fixes, format's features have been enhanced. See perlform.

respectively.