After looking into this and doing some research, "CalculationFunction to include async WCF Support" has been determined to be a new product idea. You can suggest new product ideas for future versions (or vote for existing ones) at http://ideas.infragistics.com.

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3. Add your product idea and be sure to be specific and provide as much detail as possible. Explain the context in which a feature would be used, why it is needed, why it can’t be accomplished today, and who would benefit from it. You can even add screenshots to build a stronger case. Remember that for your suggestion to be successful, you need other members of the community to vote for it. Be convincing!
4. “Include a link to this thread” in your idea so product management will be able to look back at this case. 

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Also you can contact with our consulting team here:

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if you want us to make a custom implementation for you for the Calculation Manager.

Hello Javier,

Thank you for your post. I have been looking into it and I can suggest you see this links:

http://stackoverflow.com/questions/4047132/how-can-i-wait-for-an-async-wcf-service-to-complete

and

http://msdn.microsoft.com/en-us/library/ms730059.aspx

and

http://msdn.microsoft.com/en-us/library/ms731177.aspx

where it is explained how to call a WCF asynchronous and add a “completed”/ “ended” event to indicate that the operation is completed. Once you did this you can call the CalcualtionFunction’s Evaluate method this event’s handler. Also, if you have further questions related with WCF I can suggest you ask them in the MSDN forums, since there you can get an answer from and MS expert.