I truly hope that the area in front of the train station doesn't become too cluttered, but for the most part I think this is a useful change. It seems we all agree that extra queue space is needful, specifically during Haunted Mansion Holiday. I'm also pleased to note that it seems to be a normal garden area, matching the mansion exterior, rather than something overtly creepy. In fact, the concept art brought the Winchester House to mind. That said, it would be fun if they could work in a subtle hint of the houses' supernatural nature.
I'm not fond of the trellis though. It never occurred to me that the area might need shade as it is surrounded on three sides by the mansion, the berm and a large tree. It's disappointing that the trellis will alter the partial view of the riverfront to no view at all.
As for the gift shop, I don't care for it and it seems terribly placed. The timing is so strange, as the queue space it's being built on will become vital as soon as Tiana's Bayou Adventure opens. While I can see the merit in Disney's eyes of having a gift shop right at the exit, there is already a sufficient venue in New Orleans Square. I suppose it will be rethemed as well.