PDF::API2->open($filename) no longer reads the entire file into memory before working on it, instead reading from the file as needed.
PDF files containing cross-reference streams can now be modified and saved normally. Previously, they were read-only.
There is now an -align-last option for justified text to specify how the final line should be justified.
Renamed $text->lead(...) to $text->leading(...). The old name is deprecated but will continue to work. If you're modifying PDF::API2 objects by editing their hash values instead of using these accessors, you'll need to update your code.
Added a -compress option (on by default) to PDF::API2->new(), open(), and open_scalar(). If disabled, most streams won't be compressed, which can simplify debugging.