...
This document is intended to document planned uPortal Framework development occuring planned to occur over the next 6 months (until the Fall 2006 Developer Meeting). The following branches are slated for active development. Unless otherwise stated, new features listed for in a lower numbered release can be expected to also be incorporated into any higher number releases – e.g. 2.5.x features can be expected to also be present in 2.6.x. Which features are targeted for which a specific branch is determined by the Release Strategy
...
Release Engineering: ~edalquist
Summary
uPortal 3.x is a project an independent development branch currently located in the JA-SIG sandbox. It represents a complete re-architecture of the uPortal framework. While it is expected to encompass most of the featureset of uPortal 2.x, it is a separate codebase, and work items listed above do not apply to uP 3.x. This release is incomplete, undergoing active development, and may change at any time. It is NOT recommended for production deployment as it may change at any this time. While a migration path from uPortal 2.x is a high-priority work item for the uP 3.x project, backwards compatibility is NOT guaranteed, and significant work may be required to migrate existing installations.
...