TL;DR
Please don't spoil or tease any new enemies that will be included in the 2.0 expansion.What ?
Avoiding spoilers is a particular aesthetic/perspective for many gamers. Support those players by letting them reveal/encounter new enemies during their own play experience after 2.0 launch.FFF are a great resource for many, many players. Many of those players like getting the previews of upcoming features. In general I think this is good content, especially since in most cases one needs to read and engage in discussion to discover any newly revealed features.
That said, I think that even players that enjoy spoilers could still benefit from exploring some mysteries in a new game. Especially when that mystery comes with danger.