I really hope it comes with lots of exploring and adventuring. And some less adventurous/more touristy things for people who don't like puzzle solving.
I loved WA, it's the only reason I sometimes go back to TS3 (even if it's glitchy). I even have a TS4 version of my TS3 adventurer Archer who will be very pleased with this pack. I'm definitely buying (then again, I have all packs, so that's not really surprising).
Archer:
TS3
https://68.media.tumblr.com/7931d31829b65192e0f56235a0451617/tumblr_ohmplf9ux51v8k7elo1_1280.jpg
TS4
https://78.media.tumblr.com/af639809d2cbe070e9b3e51aba54fe74/tumblr_ojpxtzlnE31v8k7elo1_1280.jpg
https://78.media.tumblr.com/083c4f825b36ae48b9449d12564883b7/tumblr_ojpxtzlnE31v8k7elo4_1280.jpg
I'm guessing it'll come out mid-March - the latest possible for "winter". As we'll most likely get Laundry Day sometime this month and we'll probably get some free, Valentine's themed stuff in February. That's my guess.