Document additional changes: #611, #567, #566, #579.

draft-ietf-ppm-dap.md

@@ -166,6 +166,8 @@ input is ever seen in the clear by any aggregator.
   how report IDs must be checked and stored in order to correctly detect
   replays.
 
+- Remove support for per-task HPKE configurations. (\*)
+
 - Remove the `max_batch_size` parameter of the fixed-size query type.
 
 - Rename "query type" to "batch mode", to align the name of this configuration
@@ -178,12 +180,21 @@ input is ever seen in the clear by any aggregator.
   was removed in draft 11, as it is required to decrypt collection results in
   some cases. (\*)
 
+- Update `PrepareError` allocations in order to remove an unused value and to
+  reserve the zero value as unused. (\*)
+
 - Document distributed-system and synchronization concerns in the operational
   considerations section.
 
 - Document additional storage and runtime requirements in the operational
   considerations section.
 
+- Document deviations from the RFC 8446 presentation language for structures
+  described in this specification.
+
+- Clarify that differential privacy mitigations will help with privacy, rather
+  than robustness, in the operational considerations section.
+
 - Bump version tag from "dap-11" to "dap-12". (\*)
 
 11: