Got the news that the migration tool has been updated 5 days ago by the ADO.NET team.
You can get the package from NuGet using the command Install-Package EntityFramework.Migrations or Update-Package EntityFramework.Migrations if you have Alpha 3 installed. Going forward the migration tool will be RTM’ed as part of Entity Framework 4.3.
For someone coming from Alpha, I see a few changes
1. Settings.cs inside Migration folder has been replaced with Configuration.cs. You have to delete the old Settings.ca file
2. ChangeColumn API is now called AlterColumn
You may want to check an alternative EF Code-First migration strategy:
EntityFramework.SchemaCompare – http://github.com/kriasoft/data