I am not sure if this is the right place for it, but will you be able to use .blend (Blender files) into it? Also, if there was a specific modding tool for it sometime close to release, that would be nice. Please give us some details on the ease of modding, ect. (maybe some simple tutorials too)
This has been answered multiple times already. You can download Cryblend (http://www.crydev.net/newspage.php?news=89611) and use it to export blender models into cryengine. They are working on (or want to work on) a tool to aid vehicle creation. Probably something very simple that allows you to place meshes or see/edit the nde beam model in 3d. However they are not planning on making any sort of "modding tool" that lets you easily create vehicles without much effort. If you cant figure out the vehicle files then your shouldnt be making mods... Also considering this has the word "questions" in the title, it probably belongs in the Questions portion of the forum yeah?