Tweetbot 6 is here with support for cards and polls, and a new subscription model of $0.99 per month or $5.99 per year. You don't need to take out the subscription model, but it does limit what you can do. 

The trade-off here is that you can take the subscription out for the app and get a chronological timeline with a few added features or use Twitter's own app, which brings with it its own benefits and drawbacks.

After spending more time than I care to admit on Twitter's own client, I've plumped for the annual subscription for Tweetbot 6. Over time I hope that we'll get to see more features added to Tweetbot.