Hi,
There are no plans on releasing a 900 MHz spin on the ePMP line.
However, we do plan to have a 900 MHz offering on the 450 line later this year. Matt touches upon it in this thread: http://community.cambiumnetworks.com/t5/PMP-450/PMP-450-Ask-the-Experts-May-13/m-p/40284#M689
Thanks,
Sriram