DMO is already working on some of the variants and the team was kind enough to send us a few screenshots of their work.
One of the biggest changes is "the extended cockpit/cabin variant which makes for a more accurate representation of the Corpo Forestale aircraft. The special radome/nose-hood that they use still needs to be modeled but the bulk of the paint scheme is done."
The E version will NOT come out with the first version of the helicopter but rather released in a future update. This means the first version can be released earlier as work on this model will not interfere with the development workflow.
According to DMO, the project is very close to be finished but they didn't indicate any release date yet.