I think it has to do with the publicity machinary, i mean it is still quite a long time until the album is due to release and the machinary is just starting. The only official info we have got from U2.com is the name of six songs, and that i think was much because of that article in Q.
I might have missed it, but i haven't read anywhere that it is official that the first single is Vertigo (although it seems likely). The single we should have more official info on soon i guess.
The release dates we know because it is probably something that needs to be decided in time, because of planning etc, and that info have come from the recordcompany, not from the U2 camp directly.
The reason why the title hasn't been released is because i believe that U2 want to go out with a pressrelease with alot of info on the new album, along with the name of it, kinda like: "this is U2s new album, it sound like this, is about this and that, and is called x". And as i said above, we still have some months to go before the album is due.