So do I still need to do WvW to get the warclaw?

You do not, it is unlocked via the story for JW.

@lorty Good question. Have a look at the Version History section of https://wiki.guildwars2.com/wiki/Warclaw

A single visit to WvW will unlock it providing you own Janthir Wilds and either PoF or HoT.

think not, you`ll get it from JW story.