One needs to note that Solasta's full launch is happening at the end of May. Releasing Patch 5 on the same week would be in pretty bad form.
Why? O_o If they have something to show, i dont see any reason to keep it for themselves, just bcs "some other game will be showing something" at same time ... :-/
I think it'd mainly to avoid competing or seem like they are competing? Though I think most people wouldn't see it as competing and more like "Woah, more D&D content, woo!"