I have read the forum a bit, and would ask some things:
1.-How does the dropships will work in game? as bases, deploying units at battleground, will have defensive weapons? will both clan and IS have dropships?
They will be used as defensive bases only. You wont be able to move them around during battle. IIRC both will have drop ships depending on the map and mission.
2.- Mech movement will be similar to steelbatallion, but will transfer speed sensation of 70kmh on heavy mechs or, for example, in a 100kmh Raven?
Not sure what you mean with that but game engine is supposed to be real. Planes did look rather slow but since mechs are lower on the ground the feeling might be different.
3.-Have a list of electronics, armours, engines, cammos and so for be included at mechlab?
There will be no real mechlab. Mechs might have some optional weapon mounts but you will not be able to customize them as freely as in Mech4 for example - balance is a bitch

4.- Special cameras:
Aim from arms moving it regardless from torso?
Shoting downward in a jump with a limited ground camera?
Rear camera?
- Aiming will be locked, not as in Mech 3 where you control the aiming separately from mechs movement.
- You might have to aim down - not sure if there will be a down camera
- ditto - unsure but there might be 3rd person
This is all by the momment

Good

Not sure if I answered all correctly since it's all still forum information. Who knows what the devs are going to add to the final product.
Cheers,
Seraph