there was already a thread about this and we shouldn't bring new one which consider this forum to be too disorganized
but i'll explain the whole sequels for you :
HXH SERIES - 62 EPISODES
HXH OVA 1 - 8 EPISODES
HXH OVA 2 - 8 EPISODES
HXH OVA 3 - 14 EPISODES
the rest of the anime is continued in the manga and it is still in production. people have said that once he's done with this arc, he might animate it. so meanwhile don't forget to get the mangas.
and if you have any other questions then you should check out this website www.nexgear.com because that's where all the fans are or anyone who keeps prasing this anime.