Unluckily sharing info about Italian National is pretty simple: it will not exist. The game is no longer supported by any company since december 2016 (when Giochi Uniti license expired) and, even if it will be published again by Asmodee Italia pretty soon, it will take some months to see the Organized Play start again. This means that 2017 was a totally dead year by ANR organized play point of view in Italy (and that’s the reason why I was thinking about attending a National abroad).
German Nationals:
Ticket for ANR are still available, but only sold at the property at the day of the event from 8:00 until 30 min before the tournament (until 10:00)
Hope this helps!
Yes. Not that it matters much; this year, any Nationals held after the 1st of September, with the exception of UK Nats, offers a bye/ticket to 2018 Worlds instead of the 2017 event.