anyone can chime in on whether preact can be covered under the same patents that apply to react ?
By what mechanism could you imagine your use of some random javascript library would be affected by being in a patent dispute with Facebook?
Depends on the ruling of use of open source code that is in a way productized. Also depends on if Preact's implementation is sufficient to infringe on React's patents (if they have any weight to them that is and are upheld)
Its not a random library, its extremely similar to React.