Valentine's Day is 2 weeks away, so it makes sense.

They rejig the schedule all the time, likely due to technical issues (problems getting codes, making sure the games work, ironing out licensing from devs). I'm pretty sure this is the reason Humble doesn't advertise their release schedule ahead of time.

But I will point out that the Alpha Fund bundle was marked as 3 weeks until served at the end of the Serious Sam Indie Royale. So it may just be a glitch of the timer system, and soon the Valentines one will be marked as a week away.

Except that Humble is currently doing an android based release and so now would be the prime time for another bundle group to do a PC based one. You can bet come Valentines day they'll have to compete with Humble (their timer is on 14 days for a new bundle) as well as Steam and most other major retailers online. Though I doubt it will be a big holiday sale I fully expect Steam to go crazy for a few days over the period

The Humble Bundle isn't "based" on any platform. It's just expanded onto the Android platform in this instance. All games in the bundle are still also for Windows, Linux and Mac.