https://www.cnet.com/roadshow/news/tesla-model-3-awd-performance-orders-next-week/

According to Musk, Tesla will open up the Model 3 order books to include dual-motor all-wheel drive and performance variants at the "end of next week." Per the same tweet (efficient!), production of these new variants will begin in July.

As for air suspension, Musk says that probably won't happen until 2019. That's also the timeframe for right-hand-drive vehicles.