This release marks the completion of the main objectives of the 7.x-2.x branch:
Refactoring of all the link handling code to a separate sub-module: print_ui (if you don't enable this module, you will still be able to acess the printer-friendly pages directly at their URLs, but you won't get any module-generated links)
Removal of the print array and of all hard-coded HTML code that was used in the old print.tpl.php to a print.tpl.php that is more inline with a normal Drupal template and to some themeable functions.
Creation of a pluggable system for the print_pdf module, that can be used to easily add more PDF libraries.
Refactoring of the dompdf, tcpdf and wkhtmltopdf to separate sub-modules (print_pdf_dompdf, print_pdf_tcpdf and print_pdf_wkhtmltopdf).
Creation of the print_pdf_module which generates PDfs using the mPDF library.
Creation of a new export format (EPUB) using the new print_epub module, which uses the PHPePub library to create EPUB files. Support for EPUB libraries is also pluggable, and PHPePub is handled in the new print_epub_phpepub sub-module.
Word of caution:
The new template differs radically from the previous one. If you had custom print templates, you'll probably need to re-write them.