Truthfully, Federation space stations, like starships, could come in many different designs--with some designs more commonly encountered than others. The new station could very well utilize pylons and other design elements that are seen on other space stations scattered across Federation space and beyond, but combined in a new configuration here.I don't think it's strange that it kept the same name - story wise, starfleet must've given it that name for a reason in the first place and it's significantly more important for stationary bases to maintain recognized designations that it is for Starships (which is something we've already seen several times). I do think the motivation behind the new design is bizarre. DS9 (the cardassian station) is destroyed, so let's replace it with a new starbase design that's obviously a hybrid of Federation and Cardassian design. Why? Federation design has never used those kinds of pylons - they use huge open spaces where the ships drive to the inside of the station.
As far the new station retaining the Deep Space Nine designation, nobody said that it was strange or even that terribly unexpected, but destroying the original just to have a shiny new one kinda reeks of what happened with the Enterprise-D, getting rid of it in Generations just for shock value or (even worse, IMO) just to a have a brand-new ship in First Contact.
Several people have said, though, that the name should have been changed as a result of the new station - I disagree with that.
It is a fair point that we don't know what all the Federation starbases look like, but off the top of my head I don't remember any single instance of any federation construction using that kind of free standing pylons, so I stand by my original opinion that it's just weird, mainly because it's so obviously designed as an 'homage' to the original DS9 even though the original DS9 was *not* Federation built.
I do agree it smacks of shock value, which I find especially stupid since it's not even being done in a visual medium. The only thing people are getting to replace the DS9 they watched for 7 years is a handful of artists renderings. Really dumb, imo.