5D2 H.264 bitrate & Raw with Magic Lantern

[Edu]

Hi there! I'm considering getting a 5D2 to shoot video, I do short-films and some audio-visual art. I have seen that this camera, with no ML will record video with a bitrate near to 38mbps (correct me if I'm wrong). Can you push this over 100mbps with Magic Lantern? Does this bring any problem like overheating?

Do you think recording continuous raw video with this camera will also bring overheating problems?

And a last one... will I get better low light performance than with a 70D (wich is crop).

Thanks in advance!