Today, Microsoft released a new hotfix package for FIM 2010 R2. You can read all about it in KB2877254 (build 4.1.3469.0).
The thing to notice about this update is that most of the fixes is for the Synchronization Engine and the ECMA2 Connector Framework.
This leads me to conclude that Microsoft is betting on this framework to be the platform for connectors in FIM. I love the fact that the community and FIM customers really get a good chance to integrate tightly with FIM Synchronization Engine and build solution that match exactly their infrastructure and address their business needs for identity management.
Keep it up, Microsoft...