What do I need to do now?
AdWords API versions after v201509 will no longer support 
MutateJobService. Migrate to 
BatchJobService, 
introduced in v201509, as soon as you can. For sunset dates, check out our 
Deprecation Schedule.
What’s new?
BatchJobService supports all of the same operations as 
MutateJobService. Plus, we’ve provided some improvements:
  - Creation of dependent objects using temporary IDs
    - For example, you can create an entire campaign including ad groups and criteria in one job.
 
- Improved performance
- Better error reporting
    - If some operations failed, the errors returned by BatchJobService are correlated with those operations, making it easier to understand what went wrong.
- If the service was unable to process any operations, it returns a detailed list of errors.
 
- Higher limit on the number of operations per job
    - BatchJobServicesupports potentially hundreds of thousands of operations.
- MutateJobServiceonly supported thousands of operations.
 
Check out our 
Batch Processing guide for more details on these new features.
How do I migrate?
Thanks to the new utilities we’ve created in our 
client libraries, migration will be a simple process of passing in your existing operations to the 
BatchJobService rather than the 
MutateJobService.
Our guide has a section on 
Migrating from MutateJobService. Each of our 
client libraries have 
code examples that include utilities for the 
BatchJobService. The utilities in each of the client libraries do all of the heavy lifting for you, which will simplify your code and make the transition easier.
Where can I learn more?
If you missed our Fall 2015 workshops, we have a 
BatchJobService video with accompanying 
slides available on our 
AdWords API Workshop site.
Questions? Visit us on the 
AdWords API Forum or our 
Google+ page.
 Nadine Sundquist, AdWords API Team
 Nadine Sundquist, AdWords API Team