Brian Anderson said it better than I could:

Brendan's resignation as CEO will have no effect on Rust or Servo.

Many people at all levels of the organization are huge supporters of Rust, Servo, and Mozilla Research in general.

No change: http://www.reddit.com/r/rust/comments/224wgn/eich_steps_down...

(The "mozilla" people (brson and pcwalton) are the people to listen to there.)

AFAIK, there will be no changes due to Eich leaving Mozilla w.r.t Rust. If he had any involvement, it was minor.

None, if any. None that can be discerned from emails.