Haha, just to stop silly speculation, the 'construction' behind Wild Asia is just some new plumbing or something along those lines being installed, nothing too exciting.
Next to Wanyama just seems to be a new dumping ground for building materials from previous construction projects. There is also some metal objects which look like they use to form part of the shelter for the old stage in market square.
You may also spot the old ride and theming dumping ground at the bottom of the field opposite Land of the Dragons which has a gate near Vampire. It used to store the old Vampire cars (which I think have all gone now) plus random parts of the Action Man attraction and other bits and bobs.
If you see those three sites there is nothing to get excited by. As Ian and Nic have mentioned, we have at least a year till we get excited by anything.
Oh and another little update for this season, I noticed the signage on the annual pass day but they've just opened up the shutter. In Forbidden Kingdom there is a new show area for African Drumming. Doesn't seem to be any indication of when shows will be on or when it'll even be starting but I'm looking forward to it. The entertainment department at Chessington are fantastic and any new show is good in my books.