How can I add template suggestions by UUID? I'm looking for a solution to migrate content between environments (dev->staging->production) and currently I think I'll use UUID and Node Export (as far as I see UUID Features is still in alpha and isn't recommended by the community).

Sometimes I want to use template files or hooks (e.g. theme_preprocess_node) specific to a node created on my dev and then to upload the changes to production - this thing is impossible with the use of nids, but must be possible with uuids.
Is there any way out of the box to add theme_hook_suggestions by uuid, or do I need to implement it on my theme?

Thanks.
You should add a hook in your template.php, like this:
function MYTHEME_preprocess_node(&amp;$vars) {        
  if ($vars['node']-&gt;uuid == '12345') {
    $vars['theme_hook_suggestions'][] = 'my-best-tpl';
  }        
}