They are not appearing in the revisions, they are being saved and I can display them in the front end 🙂
Here is how I build my forms:
$new_post = array(
'post_id' => 'new',
'field_groups' => array(205),
'submit_value' => 'Create Post',
'return' => '%post_url%',
'updated_message' => 'Post has been saved.',
'html_before_fields' => '<h1 class="page-header-title">Create a New Post</h1>',
);
BTW, thanks for the help 🙂