After installing VS2008-02CTP for visual studio 2008 and opening the model I created using the previous CTP, the relational view shows the type "bit" for all fields, including the autocounter PK's. When looking at the entities, it seems that everything is ok and that this problem seems to be only in relational view component.
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Another user (don't know if he wants his name published here) informed me that DSLToolsRedist.msi isn't part of the VS2008 package. When following the instructions in the readme (remove the DSLTools package), it doesn't get installed again when running the setup batch file. The absence of this package causes the problem in mentioned in this bugreport and obviously other problems as well.
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The nick of the user mentioned inthe previous comment is MarkTab