Just installed the most recent version as of January 11, 2015.
this returns some useful info but no version:
More than 32MB RAM (134217728 bytes) available.
Changelog is writable
conf directory is writable
mb_string extension is available and will be used
Your locale C seems not to be a UTF-8 locale, you should fix this if you encounter problems.
Debugging support is disabled
You are currently not logged in
Your current permission for this page is 1
The current page is writable by the webserver
The current page is not writable by you
The search index is empty. See faq:searchindex for help on how to fix the search index. If the default indexer isn't used or the wiki is actually empty this is normal.
How can I find the installed version?