What We Left Behind

As a Worgen the last paragraph is different.

I do not know what the future holds for you and I, my friend... but Gilneas will always be a home to us both. You're a shining example of our kingdom, name. Never forget that.

After completing Beginning a New Dawn you'll get The Wall Between Us or What We Left Behind depending on your faction.
Besides of the [item=211873] mount, [spell=430283] transmog, Reclamation of Gilneas achievement, and [item=211788] toy are granted aswel.
It doesn't matter race or faction, log out then come back online after finishing the entire questline. You'll have the toy in your Toy Box, but is usable for Worgens only.

If you are on What We Left Behind, Greymane asks for some time, as he needs to visit somewhere, and Tess asks us to check on him in What We Left Behind. Turns out, Greymane is visiting Liam Greymane's tomb to talk to his son and his regrets on building the wall.

Genn Greymane says: I don't know if you would recognize me, Liam.
Genn Greymane says: All these years, the lessons I have learned. The Alliance has always offered an outstretched hand.
Genn Greymane says: There are days it feels right, and days I wonder... what if I had not built that wall?
Genn Greymane says: Would Lordaeron still stand? Would you still be...
Genn Greymane says: Ah, but listen to me. The ruminations of an old man.
Genn Greymane says: You did not live long enough to regret as I do.
Genn Greymane says: Your sister will lead the kingdom, now.
Genn Greymane says: No one could be more proud of her than your mother and I. Except perhaps you.
Genn Greymane says: Rest well, my son. Gilneas is in the best of hands.

If you are on The Wall Between Us, Lilian and Queen Calia in Pyrewood Village are having a conversation.

Calia Menethil says: Thank you for your assistance, Funkowah. I know I asked much of you in aiding the Gilneans.
Calia Menethil says: I only hope that Tess continues to prove more... diplomatic than her father.
Lilian Voss says: I know her well. She cares far more about what people do than what they are.
Lilian Voss says: Still, it's probably best if we give the Gilneans some space for the time being. Let them enjoy their homecoming.
Calia Menethil says: As they allowed the Forsaken to do, not too long ago. We've kept our word. It's time we returned home as well.

Link to the entire Reclamation of Gilneas Questline in Patch 10.2.5

As someone who loves playing worgens and has always been interested in how the Gilnean story would progress, this was a huge disappointment. It was very underwhelming and then the city is just empty. A shame that Bliz has made been making so much money on us and can't give us a decent story or even complete a story before releasing it.