Yes, I'm adding support for arbitrary text-based formats, including LaTeX. So it will be possible to write LaTeX and see a live HMTL preview generated by Pandoc.
In principle, it should be possible to create a PDF preview with proper SyncTeX support for synchronizing LaTeX source and PDF preview locations, but that gets complicated when Pandoc+LaTeX generate the PDF. It may be best to leave LaTeX-PDF previews to dedicated LaTeX previewers that don't involve Pandoc.
I actually released my extension around the same time that the Quarto extension came out. Quarto is great for documents running R code or needing some of Quarto's advanced document features. My extension has scroll sync and the preview updates live while you type. If you need code execution, you can use multiple Jupyter kernels per document and execute inline code. Also, code execution is non-blocking, so the preview still updates when you type, and code output appears live as it becomes available.
In principle, it should be possible to create a PDF preview with proper SyncTeX support for synchronizing LaTeX source and PDF preview locations, but that gets complicated when Pandoc+LaTeX generate the PDF. It may be best to leave LaTeX-PDF previews to dedicated LaTeX previewers that don't involve Pandoc.