Other variants of the aircraft are on the list. The problem is that a -400 and -500 has different aerodynamics than the -300, so we need to have separate (planemaker) aircraft for those. This is why we want to "finish" the -300 as much as possible before we make other variants or it will be an update and support nightmare for both you and us. As for a cargo version, that is more likely short term since it is basically only a 3D update. No decisions on the timetable for that has been set. But, the most likely (subject to change) progress is
v.1.1 for XP10
v 1.1 for XP11
Cargo version
500/400
V 1.1 for XP10 is currently in closed beta.
XP11 - as we predicted - is still a moving target. Like Austin implementing new flight model stuff still in the middle of the beta (jet engine, ground model etc), plenty of XP bugs and we expect it to be like this for a few more months.