update todo

TODO.md

@@ -2,14 +2,45 @@
 
 ## Big Ticket Items
 
-N/A
+Implementation of WebGPU backend  
+Target: `Human` v2.3 with `Chrome` v94 and `TFJS` v4.0
+
+<br>
 
 ## Work in Progress
 
-N/A
+WebGL shader optimizations for faster load and initial detection
+
+- Implement WebGL uniforms for shaders: https://github.com/tensorflow/tfjs/issues/5205
+- Fix shader packing: https://github.com/tensorflow/tfjs/issues/5343
+
+<br>
 
 ## Known Issues
 
+### Object Detection
+
+Object detection using CenterNet or NanoDet models is not working when using WASM backend due to missing kernel ops in TFJS  
+Target: `Human` v2.2 with `TFJS` v3.9
+
 - CenterNet with WASM: <https://github.com/tensorflow/tfjs/issues/5110>
 - NanoDet with WASM: <https://github.com/tensorflow/tfjs/issues/4824>
-- BlazeFace and HandPose rotation correction in NodeJS: <https://github.com/tensorflow/tfjs/issues/4066>
+
+### Face Detection
+
+Enhanced rotation correction for face detection is not working in NodeJS due to missing kernel op in TFJS  
+Feature is automatically disabled in NodeJS without user impact  
+Target: `Human` v2.2 with `TFJS` v3.9
+
+- BlazeFace rotation correction in NodeJS: <https://github.com/tensorflow/tfjs/issues/4066>
+
+### Hand Detection
+
+Enhanced rotation correction for hand detection is not working in NodeJS due to missing kernel op in TFJS  
+Feature is automatically disabled in NodeJS without user impact  
+Target: `Human` v2.2 with `TFJS` v3.9
+
+- HandPose rotation correction in NodeJS: <https://github.com/tensorflow/tfjs/issues/4066>
+
+Hand detection using WASM backend has reduced precision due to math rounding errors in backend  
+Target: N/A