I am getting a new concert ukulele and I was wondering whether the tuning is different for a concert?
is it still GCEA? or is there a better sounding tuning than soprano standard?
The short answer is no, the tunings are not different. The soprano and concert are usually tuned the same way, with CGEA. The baritone uke is the only size that is normally tuned differently.
As far as "better sounding" goes, that's a matter of personal preference. One option you might try is to use a low G string tune the G as a low G instead of the normal re-entrant high G.