"We know that while upgrading these sets is a fun experience, it does take a commitment of time and effort. Lest it feel like a bummer earning this set just to have the new armor system make it somewhat obsolete when Shadowkeep releases, we decided, based on player feedback, to make the Solstice of Heroes armor set the first armor 2.0 set you will receive (assuming you earn it, of course). Whatever full Legendary sets you earn now will have their new armor 2.0 versions waiting for you to pick up from the Gunsmith when Shadowkeep releases. You will be able to see only the set for the character you are logged in as; you will have to switch characters to claim other eligible sets."
Nope, just Solstice armor. It's bad phrasing but the next sentence makes it clear.
You will be able to see only the set for the character you are logged in as; you will have to switch characters to claim other eligible sets.
"The set" refers to the solstice legendary set.
I could be wrong but that's what that appears to be said here. Perhaps /u/Dmg04 or /u/cozmo23 could clarify.
It's just the Solstice armor. Sorry, I guess I thought the context around it made that clear.