Luck of support for SQLCMD variables in deploy using powershell

Hi, we found that using SSDT with automated deployments is a real chalange, especially with power shell scripts with SQLCMD variables, lack of information for SSDT 2012 and wrong sample code is very annoying, is Microsoft Team using SSDT for internal staff, we are talking about DAC v3.We have MSDN subscription and would like to get some expose of this issues with SQL team.