What Nathan said. D8 is not ready for any actual testing. Developers are welcome to familiarise themselves with code/structure changes, but it is more effective to keep track of Note by AlexT for Developers - he posts all new APIs and convention updates.
thanx for your answers... See.. i just can't wait for D8 :)
@Andrew, could you please give me a link to that post of AlexT?
thanx
buzz