docs(README): update arxiv link

Author: Kin-Zhang

README.md

@@ -1,17 +1,39 @@
 DeltaFlow
 ---
 
-Status: Under Review 🚀
+[![arXiv](https://img.shields.io/badge/arXiv-2508.17054-b31b1b?logo=arxiv&logoColor=white)](https://arxiv.org/abs/2508.17054)
+<!-- [![PWC](https://img.shields.io/endpoint.svg?url=https://paperswithcode.com/badge/seflow-a-self-supervised-scene-flow-method-in/self-supervised-scene-flow-estimation-on-1)](https://paperswithcode.com/sota/self-supervised-scene-flow-estimation-on-1?p=seflow-a-self-supervised-scene-flow-method-in) -->
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+<!-- [![video](https://img.shields.io/badge/video-YouTube-FF0000?logo=youtube&logoColor=white)](https://youtu.be/fQqx2IES-VI) -->
 
-We appreciate your interest! The work is actively under peer review. 
+Status: Under Review 🚀
 
-We will release the full codebase, trained models, supplementary materials and all baselines upon acceptance and publication. It may around early October 2025.
+We will release the full codebase, trained models, supplementary materials and all baselines upon acceptance and publication.
 
 Stay tuned and feel free to star ⭐ this repository to get notified when we publish.
 
 
 🔗 While you wait, explore our codebase: [KTH-RPL/OpenSceneFlow](https://github.com/KTH-RPL/OpenSceneFlow).
 
-- 2025/08/24: I'm updating some codes for early release. Please be patient.
-- 2025/08/24: Updating train data augmentation as illustrated in the DeltaFlow paper.
+**News w. TBD**:
+
+- 2025/08/24: I'm updating some codes for early release. 
+- [x] 2025/08/24: Updating train data augmentation as illustrated in the DeltaFlow paper.
+- [x] 2025/08/25: Updating paper preprint link.
+- [ ] DeltaFlow Model python file.
+- [ ] pre-trained weights upload.
+- [ ] DeltaFlow Loss fn.
+- [ ] Merged into [OpenSceneFlow](https://github.com/KTH-RPL/OpenSceneFlow)
+
+## Cite & Acknowledgements
+
+```
+@article{zhang2025deltaflow,
+    title={{DeltaFlow}: An Efficient Multi-frame Scene Flow Estimation Method},
+    author={Zhang, Qingwen and Zhu, Xiaomeng and Zhang, Yushan and Cai, Yixi and Andersson, Olov and Jensfelt, Patric},
+    year={2025},
+    journal={arXiv preprint arXiv:2508.17054},
+}
+```
 
+This work was partially supported by the Wallenberg AI, Autonomous Systems and Software Program (WASP) funded by the Knut and Alice Wallenberg Foundation and Prosense (2020-02963) funded by Vinnova.