New WP (3.3+) uses plupload, which we now fully integrated into RW Meta Box.
The basic meta box before any file was via drag & drop.
Plupload during upload - Status "loading/error" have background images for a clean UI.
The "Uploaded Images" title appears only on demand.
The "TITLE string" headline (hndle bar) can be set during setup of the meta box.
The "drag & drop file here" string is customizable with the following filter:
function alter_drop_string( $string )
return __( 'drag & drop whatever here', 'YOUR TEXTDOMAIN' );
add_filter( 'rwmb_upload_drop_string', 'alter_drop_string' );
This filter changes the string of all Plupload meta boxes, so you should care about checking
$GLOBALS['hook_suffix'] and output a different string for your post/page/CPT.