Addax are coming from Germany, they should have arrived last August and will be going in the paddock next to the onager and camels. There used to be a sign announcing their arrival. The reason they are not in the zoo is becuase there was an outbreak of blue-tongue disease in Germany last year, so the movement of even-toed ungulates into the UK was prohibited. Edinburgh have recently imported deer from the continent, and Chester have had their pigs, so I assume the ban is no longer in place. If they're still not there when I next visit I'll try to find out why.
Tim Rowlands, the team leader for the giraffe section told me last October he was negotiating with Helsinki to bring in some Persian Goitred Gazelles. They have a herd of about 20 so it should not be a problem obtaing them. I think he said he was waiting for Helsinki to catch them up when they do the annual health check. He also wants a second Asian gazelle species, this may be Bennett's Gazelle. The goitred gazells will be housed with the onagers and camels, but not until the indoor accommodation under the bridge has been modified.
Hopefully both these species will be at Chester before the end of the year.