Very few changes this season.  Despite a bigger budget, they sunk it into stuff like prizes and props and not messing with the studio.  Probably a good idea.
 

• The theme has changed..it sounds much "cheaper" than before
• Sam has longer hair.  Looks like the 'Dutch Girl' from those bottles of bleach.
• Akua has long hair too
• The small plastic swimming pools have been replaced with deeper, inflatable pools
• The Punisher has some barely noticable accents added to his costume
• A few new sponsors