I know they have these HDs for the EX3 and heard there was a software/firmware update to get it to work with the EX1 but I haven't heard anything confirmed. Does anyone know if this will work with the EX1?

Thanks in advance!

It works with firmware 1.11 for the EX1

However there are plenty of posts around here detailing problems with the unit so that you might want to reconsider.