[Doc] Add notice about breaking changes to VLMs (vllm-project#5818)

docs/source/models/vlm.rst

@@ -5,6 +5,9 @@ Using VLMs
 
 vLLM provides experimental support for Vision Language Models (VLMs). This document shows you how to run and serve these models using vLLM.
 
+.. important::
+    We are actively iterating on VLM support. Expect breaking changes to VLM usage and development in upcoming releases without prior deprecation.
+
 Engine Arguments
 ----------------
 
@@ -39,6 +42,10 @@ To initialize a VLM, the aforementioned arguments must be passed to the ``LLM``
         image_feature_size=576,
     )
 
+.. important::
+    We will remove most of the vision-specific arguments in a future release as they can be inferred from the HuggingFace configuration.
+
+
 To pass an image to the model, note the following in :class:`vllm.inputs.PromptStrictInputs`:
 
 * ``prompt``: The prompt should have a number of ``<image>`` tokens equal to ``image_feature_size``.
@@ -63,6 +70,9 @@ To pass an image to the model, note the following in :class:`vllm.inputs.PromptS
 
 A code example can be found in `examples/llava_example.py <https://github.com/vllm-project/vllm/blob/main/examples/llava_example.py>`_.
 
+.. important::
+    We will remove the need to format image tokens in a future release. Afterwards, the input text will follow the same format as that for the original HuggingFace model.
+
 Online OpenAI Vision API Compatible Inference
 ----------------------------------------------
 
@@ -89,6 +99,9 @@ Below is an example on how to launch the same ``llava-hf/llava-1.5-7b-hf`` with
         --image-feature-size 576 \
         --chat-template template_llava.jinja
 
+.. important::
+    We will remove most of the vision-specific arguments in a future release as they can be inferred from the HuggingFace configuration.
+
 To consume the server, you can use the OpenAI client like in the example below:
 
 .. code-block:: python