Great news. I'm probably more likely to use Sync, but seeing not one but two well regarded Android Reddit apps migrate to Lemmy is just bloody awesome.
Thunder feels pretty close. Turn on compact mode + thumbnails on the right and it's visually almost identical to how I had Relay set up. It even has the short swipe to upvote, long swipe to downvote actions.
Thunder opens articles in Samsung Internet Browser of all things. I can't figure out how to change it to Firefox or Chrome. Otherwise I like it OK, although I wish I could turn off the animations
Yes, it's going to be called Sync for Lemmy and preregistration opened two days ago. It most likely will still be some weeks before it becomes available. Ljdawson stated the target is 6 weeks, so that would be somewhere in the middle of August.