What is was supposed to start rolling out to Eee Pad Slider SL101 on April 25th according to Asus support website is apparently pushing out now in the US. The update will bring your tablet to firmware build 22.214.171.124.
If no notification there for you to upgrade yet, please manually check if its there over the air by heading into Settings > About tablet > Check for updates.
Did you get your yet?
source Asus [Twitter]