We are working on De-Icing right now and, it will be made as an additional service at the parking spot, but not as a separate menu.
When you ask for departure clearance and pushback IF there's ice on the airplane or there's a risk of ice formation (checking weather, clouds and outside temp), a warning just before pushback will ask you if you want to call a de-ice service. If you reply Yes, the deicers will come and will deice your airplane, using the appropriate procedure in either two steps (de-icing first and anti-icing next with different fluids), or in a single step.
After de-icing is done, you'll be able to continue the pushback.
This will be the standard service. As an additional feature, that will require a specific airport customization, we'll have some de-icing structures (either using hot fluids or infrared technology) at dedicated positions in the airport. This could possibly work both on our own airports, but also on 3rd party airports that already feature such structures in a non-working way, without any need to be supported by the scenery developer.