-Added Required.Always attribute validation when writing JSON as well reading
-Added TypeNameHandling.Auto to automatically write the type name when a value doesn't match the declared type
-Fixed reading multi-byte strings in BSON
-Added TypeNameAssemblyFormat property to JsonSerializer. Property controls whether .NET type names are written with a full or partial assembly name
-Added TypeNameHandling to JsonProperty attribute. Allows a type names to be included on an individual property basis
-Fixed serializing HashSet<T>
-Additional permission demands added to DynamicCodeGeneration flag
-Fix DynamicReflectionDelegateFactory erroring when calling static methods
-Fix CustomCreationConverter to return null when converting a null JSON value
-Added WriteObjectId to BsonWriter
-Added BsonObjectId and BsonObjectIdConverter classes
-Added KeyValuePairConverter
-Added DynamicCodeGeneration flag to DefaultContractResolver
-Changed JsonConverter.ReadJson to add an extra parameter: currentValue
-Add SerializeXNode, DeserializeXNode methods to JsonConvert
-Remove "-" prefix when serializing a JSON constructor, prefix not compatible with XML naming standard
-Fixed error caused by property properties on a base class when reflecting a type
-Fixed property CanRead and CanWrite coming back as false when a base class property has a private getter/setter visibility
-Added ISerializable support
-Changed dictionary serialization to fall back to ToString for keys
-Changed schema generator to use JsonContracts to determine schema information
-Fixed schema validation bugs when schema has no properties
-Fixed not marking dictionary and array schemas as nullable
-Fixed serializing generic dictionary that doesn't implement IDictionary
-Added StreamingContext to JsonSerializer
-Added CreateMemberValueProvider method to DefaultContractResolver
-Fixed not falling back the original class from the metadata class when attribute not found
-Fix error message when attempting to deserialize custom dictionary with no default constructor
-Fix serializing private base members marked with JsonProperty attribute
-Fix performance issue when deserializing to object member
-Fix dictionary key encoding when serializing
-Fix WrappedDictionary being set to a property when deserializing
-Fix Silverlight serialization security error