Basically the teams are not allowed to announce its drivers before ADAC announces the teams and cars. BMW's done it but that was down to miscommunication and ADAC wasn't happy about it.
According to GT Place, on Wednesday there's a DTM Kick-Off Day when all of the teams will be announced and only afterwards the teams will be allowed to present their drivers and so on.
Seems a bit strange but probably that's down to the registration process.
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