I can't say my full thoughts on the whole case as I'm just in investigation, day 2, but Turnabout Reclaimed is, so far, one of the best cases in AA5 (better than 5-1, 5-2, 5-4 and alongside 5-3 in how good it is).
For those who aren't aware, the DLC case was released on Thursday in North America and Europe for $5.99 and it features Phoenix Wright's first case after regaining his attorney's badge. The premise involves defending an orca convicted of murder:
This case feels like it involves everything that makes Ace Attorney cases great. The anime cutscenes in this case are no doubt the best in the game (well produced, well implemented, funny, and lacking the terrible VA of some of the others), there are numerous references to the past games and characters and the intrigue itself is so far really compelling.
If you own AA5, you should probably own and play through this DLC case as well.