Making this official: The way the theme picking will be handled is I am going to pick 4 themes and then towards the end of Friday's stream, around the time the jam will be kicking off, I'll run a poll where viewers can vote on which of the 4 themes it should be.
SO...
If you want a little bit of input over the final theme (or you just want to see the theme announcement live), be watching the stream at around 1:30-2:00PM UK time on Friday!
Here's the link: