They could still go for that and only have the titles on the spine, but I guess that's unlikely.
I wouldn't be surprised if they now had titles for merchandising and sales purposes. Pocket wouldn't want people in bookstores to miss a book because they were confused by the lack of a title, and they would want people to be able to find the book online through searches. A title cuts adds clarity. I'm only speculating -- I don't know that that's the reason -- but it wouldn't surprise me at all because I deal with the very thing in my day job.