I just thought I'd chime in and say that I did assume they were official mockups because I don't follow LibreOffice close enough to know that documentfoundation.org is the official developer and I didn't think it would be unusual for another website (Web Upd8, which I've never heard of before) to post news about (official) mockups.
It's not uncommon for news blogs to get (sometimes exclusive) screens or information from official sources and report on it. I assumed this was the case with these mockups.
Although if I had bothered to click through to the article and read it, it does make it clear that these are not official. So my ignorance is mostly my own fault.
Since these are just fan-made images I do agree that it changes the discussion somewhat, from "Oh, look what they're considering" to "Oh, look what someone who doesn't necessarily have any influence on the decision thinks they should consider."
Ah! At least someone agrees with me.









