@ OP:
If you go ahead an listen to that hour-long, rather old podcast, Todd Howard confirms that there will be 10 races in Skyrim. He didn't specify, but I highly doubt that he will suddenly not only remove a popular race (which they all are) and then add something new.
Arena had 8 races - Argonian, Breton, High Elf, Dark Elf, Khajiit, Nord, Redguard and Wood Elf.
Daggerfall had the same amount, but added Vampirism and Lycanthropy obtainable through gameplay.
Morrowind added Orcs and Imperials, renamed the elves to Mer, kept Vampire and Werewolf (Bloodmoon) and added "Blight disease" as a form of zombification.
Oblivion had all 10 starting races and Vampire obtainable through gameplay. In SI, you could also become the new Daedric Prince of Madness.
Skyrim will probably have Vampirism in addition to the 10 playable races. If the Sheogorath shrine is in the game, he will likely be someone new (the hero from Oblivion).
Personally, I don't know how anyone could even play as an argonian (at least on your main character)! I can't really relate to a lizard...
Probably just as much as Anthony Hopkins can relate to Hannibal Lechter.