I wrote a message to Oscar from U1 Technology because of LF Online and finally got an answer:

Hi Matthias,

Nice to hear from you again.
I just double check my mail box and find your email again.
Anyway, yes, the english version is developing right now, hopfully it can be launched on the internet during summer.
The content of first version will have 16 stages and 15 missions with around 20 characters available.

We will change http://www.littlefighteronline.com into english and different language will split into different pages.