Bifrost 2.5.1.0 provides new USD nodes for binding materials and working with collections, as well as other improvements.
Note that the assign_usd_material node has been replaced by bind_material, which has additional ports for specifying the material's purpose and binding it to collections. Old scenes with graphs containing assign_usd_material still work; however, you can no longer create this node using the Tab menu.
See the Bifrost Release Notes for a complete list of features and bug fixes included in this version.
Remember that you can always download the latest version of Bifrost by visiting the Bifrost Download Center.