I agree that the set of extensions Google sponsored appear strange. I could see .dev, .app, .mov, .zip and .page to some degree. Re Kate's question the key point is how they would be used by end users. The Japanese language extension in the list means 'everyone' but apparently just under 2000 people yet feel everyone applies to them! The .soy apparently has a meaning as "I am" in some languages, as well as the obvious food group one. Again it has attracted few users.
I think that .page will find some traction, but less so than .app. While it could be used in various senses as in communicate with or as an assistant or literary sense of pages in books, I think IF it is successful it will be predominantly as an extension for single page websites used for documents, resumes, documentation, statistics, etc. It will be interesting to see how many TM holders signed on to .page - that was substantial with .app.
ps Answering my own question re how many in TM stage, I see it is up on NameStat: 320 registrations in TM stage so far, with 149 through MarkMonitor -- t
his link should show the numbers up to the previous day.