Doctor guy = Grand Maester Pycelle
New queen = Margaery Tyrell (now Margaery Baratheon)
I won’t confirm or deny…but if you watch the episode very closely and make some intuitive connections, you can see quite clearly see some sleight of hand on the part of the poisoner. I really love how subtle it was; it was even more so in the books, though. There were some clues expertly written in, but nothing in the realm of confirmation until the next book. In fact, in case you weren’t looking for a poisoner, it looked like he simply choked on some pie.
If you want a clue to help you get started unraveling the plot early, look down below, but remember…MINOR SPOILERS
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SPOILER[COLOR=‘black’]Ser Dontos seemed pretty ready and prepared to escort Sansa out right as Joff began to succumb…he even seemed capable and sober! But he was busy being Joff’s fool, so it couldn’t have been him to carry out the deed…SPOILER