You still have time to pick out some yarn and cast on with everyone else on Monday. Sign up for the kal by simply purchasing the pattern. Head on over to the thread on Ravelry for even more yarn porn (willpower super powers required if you are on any kind of yarn diet or stashdown!).
Here in the studio, we are definitely feeling like it is sweater time. Some of us are still finishing up accessories from our holiday knitting, but we are excited about making sweaters and the workplace chat is full of links to Ravelry and other pattern sources with riffs on what yarn we could use and how we could adapt them.