There will be updated CMDB connectors for 4.0. I am not aware of a time frame when they will be posted.
In the meantime the older connectors should work with 4.0 and allow you to build out processes as you require.
If you find something that is not fully functional you will always be able to accomplish your design needs using the generic SOAP operators.
The main problem you will likely run into using the older version connector is with the sample processes. Most will likely work as expected, but a few will likely require a bit of hands on work to get to function, and some may require some redesigning to function properly.