If you are a developer, please build MegaGlest on your own and get in touch to contribute (or post your patches on the forums).
The only existing Blender import and export scripts for Glest are for versions before 2.5. Sorry.
Of course, you two are still both welcome to try, and it would be greatly appreciated if one of you could make said script. If you google around, you'll find lots of documentation explaining some of the things you'll have to change from 2.4x to 2.5x.