So the Daily Rewards have been upgraded:
Overall more runes, more crystals and more cards.
Any thoughts on what the third day’s reward is? I’m guessing a 3-card booster.
Judging from the graphics it’s a 5-card Origins booster.
Red / Green / Black / Blue / White / Colorless. 3 or 5 pack. We will find out in time.
Initially I was thinking vampire/human??/??/zombie/spirit/construct (in the hopes that it’s hinting at Kaladesh), but this makes much more sense.
Hello
I came back from the future and can confirm it will be coloured 5 card packs.
If d3 keeps this December daily rewards to use as the normal daily reward from the year 2017, I think there will be less grumbling about poor or dupe drop rates, or grinding for runes. 
People getting more cards = more grumbling about duplicates.
Duplicates is waaaay down my grumbling list.
I guess D3 just can’t win then. Damned if you do and Damned if you don’t. 
Oh man, I must be blind, I thought you meant the 5th reward. Might the other rewards you on fact meant just be the cards shown? Next up would be Blood Mad Vampire, then.
This is obviously supposed to help new players get cards from previous sets. And anyway, how can more cards be a bad thing? Some people just enjoy being unhappy.
I think you will get one random card from a specific colour, we will see tomorrow 