update README

Author: WCJ-BERT

README.md

@@ -63,6 +63,7 @@
 We compare different post-training paradigms on the nuPlan dataset, evaluating on both open-loop and closed-loop metrics across common and rare driving scenarios.
 
 > **Metric notes:**
+> **Early stage**. Stable ckpts and corresponding results coming soon.
 > - **Open-loop PDMS** is aligned with [NAVSIM v1.1](https://github.com/autonomousvision/navsim) PDM Score. *Common* denotes the standard `navtest` split; *Rare* denotes the `navtest_failures` subset — failure-prone rare-case scenarios extracted from `navtest`.
 > - **Closed-loop Success Rate** is defined as the fraction of simulated driving episodes completed without collision or off-road failure.
 > - **Closed-loop PDMS*** is the PDM Score obtained via **SimEngine closed-loop testing**, where the planner interacts with reactive agents in simulation under real-time rendering.
@@ -132,9 +133,10 @@ WorldEngine consists of two tightly coupled subsystems:
 - [x] Rare case extraction and fine-tuning pipeline
 - [x] Comprehensive documentation and usage guides
 - [x] Hugging Face / ModelScope dataset
-- [ ] Open-source release (code, data, pre-trained models)
+- [x] Open-source release (code, data, early pre-trained models)
 - [ ] arXiv preprint
 - [ ] Behavior World Model integration
+- [ ] Stable pre-trained models
 
 
 ## Getting Started