XDA Recognized Developer XpLoDWilD of Team Hacksung is doing the work for the TF300T CM10.1, while the Huawei Ideos X5 is being worked on by XDA Forum Member gleb_grid. Nightlies are available for the TF300T now, whereas the Huawei Ideos X5 has a pre-alpha that needs a lot of work.
The TF300T Nightlies are actually quite stable. Among the issues reported is rotation not working correctly and a Superuser bug. If you don’t rotate the tablet very often, the rotation bug won’t be too annoying. And to alleviate the superuser issues, you can simply download SuperSU. Otherwise, the ROM appears to be working quite well.
Unfortunately, the Huawei Ideos X5 build is pretty rough. The ROM has been set up for development, but none of the issues have actually been fixed yet. At this point, a developer—or team of developers—will have to get their hands dirty making it work. At least it’s a start!