The new Pop Email Integration Plugin announced recently is not making it to a new release so far, as we keep on working on some performance improvements.
TargetProcess v.2.21.15 is basically a bug-fix build. We've also removed some rarely used functionality which does not bring much value to our customers, but burdens the UI and makes TargetProcess more complicated.
List of Features Removed
Integration and API
Documentation related to REST services can be found in TargetProcess Developers Portal
REST: Custom Fields array should be always represented as JSON
REST: Project Teams support: 'ProjectMembers' property for 'project' resource added
Other Fixed Bugs
Idle timeout disabled. After a long idle time, TargetProcess resumes quickly.
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TargetProcess on-demand accounts will be upgraded to v.2.21.15 next week-end.