Happy Star Wars day, everyone! ASUS got you a present: it's firmware updates with a side of source code! You can head to ASUS' site right now and download firmware version V188.8.131.52 for a few countries including the US, as well as version V184.108.40.206 if you're in Japan. Kernel source code for the TF300T is also available, in both x.17 and x.23 flavors for your downloading pleasure.
Head on over to the source link and select "Android" from the dropdown box to get your downloads.