Sgt_Kickaxe - 1:56 pm on Jan 23, 2012 (gmt 0)
im 100% updated however I do cloak the version with a security plugin
This doesn't hide the fact you're running wordpress from anyone, especially Google. Try typing in your domain name with this url added for example: www.example.com/xmlrpc.php
That file is the "ping" file used by wordpress, unless you take steps to return a 404 message for direct access it will return a message that is unique to wordpress. There are dozens of such files in a wordpress installation.
Wordpress also has a "call home" feature that contacts wordpress when you log into your dashboard, I would not be surprised to find out that Google also has access to this or some agreement with wordpress that gives up the information in exchange for help with security.
There is occasionally concern by some webmasters that their choice of cms impacts rankings. Google would take steps to even the field if one is generally worse from an seo standpoint since content is what's important, but they would need to know which cms you're using to accomplish that. Matt Cutts himself stated that Google is pretty darned good at figuring it out.
Anyway - I've gotten that message on a non-wordpress site too but I did have 3 domains sharing the same hosting account and the main was indeed wordpress.