But who will be kind to come answer my question? 
The answer is that they are trying to provide support for the FIX protocol http://en.wikipedia.org/wiki/Financial_Information_eXchange .Please learn it or be left it the dustbin. There is no way forward that continues to use the old RPC polling paradigm.
Yep, see the top of the thread. The APIs will stay the same at launch. We will probably layer on FIX support for CoinLab customers.