Multiple questions are still possible. In the new format you create multiple polls. This was an older feature request, as sometimes people would make polls with about 20 questions in them. Sometimes the user didn't want to answer them all, maybe just one or two of them and this wasn't possible in the old format. In the new format, you just add a poll for each question, which gives a bit more flexibility.
Editing the polls has never been an option with .threads either. But I can look into it at some point.
