While the whole WWDC site is set in Myriad Set, the WWDC15 logo uses (probably) a rounded version of San Francisco font (from Apple Watch). I haven't seen this

While the whole WWDC site is set in Myriad Set, the WWDC15 logo uses (probably) a rounded version of San Francisco font (from Apple Watch). I haven't seen this rounded version of SF font before or anywhere in Apple Watch UI yet.