Anet did promise us another set of legendaries for HoT. That means we will get a GS too, like it or not. It does not matter which one comes out first, what matters is that it comes out.
The biggest issue regarding the release of new legendaries is the making of their own “legendary journey” that is tough and needs alot of work. While it is fun and cool, it is also at the moment denying the player base a content that was promised. I think they should just add the new precursors (as a really rare drop in Hot maps) and the new legendaries for us to craft (Just like the Gen 1 legendaries). Skip the legendary journey and collection for now as Kalaria said.