The SSIS team has just released a white paper on upgrading to SSIS in SQL Server 2012:
Summary: Microsoft SQL Server 2012 Integration Services (SSIS) provides significant improvements in both the developer and administration experience. This article provides tips that can help to make the upgrade to Microsoft SQL Server 2012 Integration Services successful. The tips address editing package configurations and specifically connection strings, converting configurations to parameters, converting packages to the project deployment model, updating Execute Package tasks to use project references and parameterizing the PackageName property.
If you’ve been using SSIS in versions prior to 2012 please take a moment to check it out. The evenings you save may be your own…
 And if you read this blog, odds are this is a safe bet.