Woah, loads has changed since I last played my god...Nook buys your town?!?!
Only when you're recreating a town and want to get straight back into playing a different town. It's for people who got invested, lost interest and want to start anew.
- - - Post Merge - - -
Yes you do! But only the ones that your villagers and Resetti requested to you, and the topiaries from Weeding Day. The others you'll have to unlock again. (main street stuff, caf?, and the ones from getting a perfect town. Not sure about the train station renovations, but I'm pretty sure you have to reunlock those too)
This is news to me! Was worried it'd be all doom and gloom but that sounds pretty neat. I haven't played all day, I just got new rats today, but I'm thinking of buying a new ACNL copy to move my favourite villagers to (basically half my town x.x). Something about getting new villagers intrigues me too.