WCF Data Servies 5.5 Pre release

Yesterday Microsoft uploaded an RC for the upcoming 5.5.0 release. 

Fully-featured server API for responding to OData queries and consuming/producing OData payloads.

Supports OData v3. Targets .NET 4.0 or Silverlight 4.0. Localized for CHS, CHT, DEU, ESN, FRA, ITA, JPN, KOR and RUS.

This release has two primary features:
  1. Significant enhancements to the URI parser and 
  2. Public data source providers
You can get this from below link