I'm glad to see the final roster finally, albeit inadvertently. Tremor looks neat, and it's nice to see Tanya back.
My biggest take away from this however, is that I hope more DLC is planned down the line. MKX will sell gangbusters with these guest characters, so I do hope more DLC is in the pipeline. No guest characters, just more classics. I find it hard to believe that Netherrealm would give certain characters brand new character models, only for them to be story mode NPCs.
You can bet your biddy that there's a market for a "MKX season 2" where characters like Baraka, Rain, Cyrax and Sektor return. Heck, you could make a DLC event called "Rise of the Tekujin" where you return the cyborgs; maybe add a new faction for multiplayer.