Transport
Q: What transports do you support?
A: What do you want? As noted above, the sync team wants to get out of the transport business. We have many bright people in Microsoft thinking about those problems. In Orcas the Visual Studio designers will focus on enabling WCF, but you can use Web Services, SSE, SyncML or if you can figure out how to convert Jelly Beans to .NET objects, you can use those as well. Essentially, you simply plug in a matching service and a proxy, and you're good to go.
[Source: Steve Lasker's FAQ Post]