Currently create-protected pages dead-end for non-admins (or, more scenario-agnostically, anyone who can't create the page) without an obvious route for discovering why the page is protected due to several reasons:

1. The create-page tab is hidden on all skins when the page is protected and user lacks the required permission.
2. MediaWiki:Noarticletext-nopermission has no parameters with protection info (in contrast to, e.g., Blockedtext).
3. MediaWiki:Titleprotectedwarning is only displayed on index.php?title=...&action=edit, which, because of #1, isn't accessible.
4. While there's {{PROTECTIONLEVEL}}, there's not, e.g., "{{PROTECTIONREASON}}," which negates use of it in templates as a workaround.

Granted, you can check the log, but that pretty much defeats the purpose of Titleprotectedwarning.

Cheers =)
-Kurt / Slakr