Everybody talk about the "unofficial" announcement of Microsoft embracing Html5 over Silverlight. And while this was never approved (unless you read between the lines) the below may be a hint.
Yesterday Microsoft had published an "early access" codeplex project with some features from the next Wcf version. The two main themes seem to be native Http support and jQuery. And not a word about Silverlight. Will there ever be security in the SL netTcp transport? Will we see more WS-Security coverage from the Wcf stack? It seems jQuery improvements got a higher priority for this release. Is the Wcf early access project a hint for a focus shift from SL to Html5? (update: more SL features will be revealed soon, hopefully they include the above).
So how does the Html5 thing affect Wcf?
This is definitely a big push to the Rest / Json / Anti WS-* approach (not that it needed it anyway). Silverlight did not support the full Wcf stack in version 4, but in theory nothing prevented it from growing into it in the next versions. Browsers in contrary cannot work with WS-Security and feel much more at home with Json over Xml. Also Rest is more natural for the web anyway.