Those cards will arrive in North America and Europe, according to the thread, which did not detail any other regions
Most major set releases also come with Commander decks, and with so many sets a year, there are a lot of Commander decks being released constantly
Your biggest problem will be defending Teval, who has no protection against removal, will suffer when cards are exiled, and who must constantly jump into the fray of battle
On multiple occasions, I have created a card and then realized that it has a spelling error or the art is slightly misaligned
If an effect allows an opponent to cast spells any time they could cast an instant (for example, if your opponent also controls Teferi), the restriction of Teferi's last ability takes precedence over that permission
Theres an interesting intersection between cards that allow you to cast your opponents cards and outlaws