Get attachments (get_posts) and WP 3.5 new uploader

You can still do this with the 3.5 uploader.

1. Click the Add Media button
2. Click the Insert Media Tab (top left)
3. Click the Media Library Tab (top center under Insert Media heading)
4. Click the Dropdown SELECT box and select Uploaded To This Page
5. Drag and drop the thumbnails to reorder them as you were able to before