first of all, and as far as i know there hasn't been any announcement regarding having the Targa Florio track in rFactor 2.
The rFactor 1 version stills being improved though. The conversion team is working hard, believe me
Regarding HistorX itself, we haven't announced a release for rF2. But i'd lie if i say we haven't thought about it. In fact, we have plans and we may even have started working with that in mind, but it's not the time yet to share any information about all that, i'm afraid.
Sorry for the long wait, but i'm sure the results will be worth it