The latest release of client SDKs is for DotNet, Unity3d and Silverlight v4 and includes a new feature: Network Simulation.
With Network Simulation you can better prepare your game for real-life conditions when you game is playable through the internet. You can add latency and give it some variation as “jitter”. You can set a percentage for lost packages. Losses are random but counted. Each values can be set independently for incoming and outgoing packets.
The new Silverlight SDK also marks the switch to Silverlight v4.0, adds encryption and let you define the receiving players of events in OpRaiseEvent.