It's only a trademark violation if the site is pretending to be sanctioned/affiliated/owned by the company. For example, we have the same issue the the up-and-coming Apple proposal.
So we have two choices:
- ask the company for permission
- make it clear we are not owned or affiliated by the company.
#2 is better because Apple would never give you permission.
You just have to do the whole "Apple is a trademark of Apple Computer Company, etc. This site is not affiliated or endorsed by Apple."
AND make sure you do not intend to confuse the public in any way (meaning, no logos, color styles, etc that could be confusing to a normal person).
Of course, I am not a lawyer, and Wordpress lawyers may disagree, but it's clear that they can't stop you from "talking about Wordpress" provided you are not pretending that you are Wordpress. Trademark on a term doesn't mean suppression of speech of that term.