Since December PDFlib 8 is available and today I finished our REALbasic for PDFLib. So in 10.1pr5 and newer you'll find a PDFLib8MBS class.
PDFlib 8 supports various PDF features according to Acrobat 9, such as Reference XObjects, layer variants, PDF Portfolios, georeferenced PDF, AES-256 encryption, and Unicode passwords.
New typographical features include complex script shaping and bidirectional formatting, fallback fonts, OpenType layout features, wrap text around paths, and text on a path.
More about PDFLib 8