All that new for Developers in MS CRM 2015 SP1 release

below are the new things released in MS CRM 2015 SP1 and things to note for MS CRM developers.

1.       Integrate Dynamics CRM data with external systems more easily

2.       Update message for specialized operations

3.       Alternate keys

4.       Change tracking

5.       Upsert for updating CRM with external data

6.       Optimistic concurrency

7.       Multiple message execution

8.       Tracing

9.       Custom actions in workflows or dialogs

10.   Integration with Parature

11.   Custom claim mapping for SharePoint server-based integration

12.   Integration with OneNote

13.   Entitlement enhancements

14.   Honoring required steps in a business process

15.   Support for additional “older than” clauses for date and time fields in FetchXML and QueryExpression

16.   Record creation and update rules

17.   Track emails at the folder level

18.   Support for new behavior of date and time values in CRM

19.   Try the Web API preview

20.   New form script capabilities

21.   Form script support for the new Knowledge Management (KM) integration with Parature

22.   Enhanced capabilities for sub-grid controls in forms

23.   More options to open forms

24.   ControlgetShowTime method for Date controls

25.   Customizable themes

26.   Rollup field enhancements

27.   Specify custom price lists for opportunities, quotes, orders, and invoices

28.   New entities

29.   New messages in the Organization web service

30.   New privileges

for more details on each item, follow below link....
https://msdn.microsoft.com/en-us/library/gg309589.aspx

Regards,
yes.sudhanshu