We’ve been looking forward to this. The preview has already made it clear that the test at the Lunar Sea Spire was just opportunistic, so the site’s namesake is still legitimate (though still unfortunately collapsed and underwater).
This episode could go a lot of ways. Really it’s a fantastic chance to highlight how Steven has grown as a hero since the early days of the series: not just the massive suite of powers he’s acquired, but how much better at making decisions he is (it’s hard to imagine New Steven tuning his ukulele while immediately under threat now).
Also, maybe a little bit of an Indiana Jones-style boulder run just for good measure? Please don’t let that one be Steven’s imagination.