Hello,
i only got name to show up by adding this function to the functions.php
this could be easily changed..
function blog9sek_add_title_to_attachment( $markup, $id ){
$att = get_post( $id );
return str_replace('<a>post_title.'" ', $markup);
}
add_filter('wp_get_attachment_link', 'blog9sek_add_title_to_attachment', 10, 2);
there is an article about adding title and description with example code at
http://ajtroxell.com/use-magnific-popup-with-wordpress-now/
what i did is playing with the init.js script, and I think I got an idea on how to do that.. using inline, it would require to modify the gallery function to actually include caption and then jquery to modify image url to get bigger image to display in the magnific popup inline display, and this way I could even display the comments..