https://www.fantasyflightgames.com/en/op/world-championships/nov/prizes/
FFG updated the Worlds portal with prizes for all the games, not just L5R. Looks like they're being rather generous to Runewars this year! The stuff that would normally be Day 2 and top 16 is part of the participation stuff, with Dice and acrylic wound counters.
The alt art card is Maegan Cyndewin .
Top 8 get movement templates, while best in faction gets a faction specific range ruler.
Top 4 get a medal and an art print of the the Elves box.
There's no mention of the side events, if they will have any additional alt arts, or if it will just be more tickets for the prize wall.