First I thought it was a problem of VS2013 RC/beta but now I installed VS2013 RTM and still have the same problem: code completion does only open after I execute it manually by strg+space. How can I turn on auto open the windows after typed e.g. a point?
Be sure that your IntelliSense is activated
Tools > Options > Text Editor > C# > Statement completion
Then, be sure Auto list members is checked and Parameter Information.