iPhone and iPad users can now join the Office Insider program, giving them early access to new Office suite features. The program gives Microsoft a way to receive more feedback, which has reportedly resulted in better publicly released software.
Officer Insider is only intended for those who regularly use the Office Mobile service. People who are inactive after joining the program will be removed.
We have limited capacity in this program so we will largely offer these spots on a first come first served basis, to enthusiastic Office fans who want to test the apps on iPhone and iPad and provide feedback. – Microsoft