Clue #1: January 22nd
Clue #2: January 29th
Clue #3: February 5th
Clue #4: February 12th

The official Mashup MKAL chat thread is here.

Yarn:
600 yds Call Me Sally Annabelle Sock 4-color gradient
or
Fingering weight yarn: 30-50g each of four colors (equal amount of each color required)

Needles: US 5- 7 (3.75-4.5 mm)
Gauge: Use a needle size that yields a drapey fabric.
Size: Mystery

Notions:
3 Stitch Markers
Yarn needle for weaving in ends