Being honest, they’re probably only saying it because “fediverse” is the current buzzword. If they do wind up doing fediverse integration (assuming they don’t ditch it for the next buzzword); I’d be prepared to bet it’ll be a closed garden where Threads instances are only able to federate with other Threads instances.

I’d also advise blocking Threads; if nothing else than for the fact that some instances are talking about defederating any instances that federate with Threads.