Yes. Mechatron (released soon), Genlab Alfa and Elysium (to be released next year) all introduces a "class" and also includes a campaign (for that class) but they are all compatible to each other.
- Is Mechatron compatible with Mutant year 0?
Mechatron, Genlab Alfa and Elysium takes place in a special area and after the campaign is played, that class enters the Zone and becomes playable with the Mutants in MYZ. Of course you can skip the campaign and join the classes. There are also new artefacts and projects that is meant to be used in the Zone. Genlab Alfa and Elysium also contains new roles and talents that any class (except robots) clan play.
(edit: to clarify - Mutant: Mechatron takes place in the underwater city of Mechatron-7, Mutant: Genlab Alpha takes place in the prison camp called Paradise Valley and Mutant: Elysium takes place in the enklave Elysium I. Where these places are in the world is up to you, but probably not that far from the Zone that you plan to play in when using Mutant: Year Zero base game).
- Could I use parts of it as a new/other sector or Ark?
All the special sectors that are unlocked as SG during the kickstarter will come out in Zone Compendiums (that contains four special sectors each). I think that the later ZC are a little bit more fleshed out than the early ones the two ZC that (I think) will come out after Mechatron (Hotell Imperator and the robot ZC).
- Are the extra "sectors" PDfs for backers available for non backers? Are those sectors format the same as previously or a little more detailed?
The Mechatron campaign is for robots alone. Humans with biomechatronic enhancements (i.e. cybernetics) will come in the Elysium expansion. The expansions itself (if you skip the campaign) can of course be used in a MYZ campaign.
- Is it possible to play Mechatron as humans? or augmented humans?
The best answer I can give is to join various groups on FB or G+ and ask there.
Hm, I have answered these questions before, I don't remember where though. Anyway that was the reason I didn't answer this one. (Or perhaps I only dreamt that I answered it).
- As I don't have much time to prepare sessions and adventures can I find somewhere a few adventures or detailed seeds of adventures on the web?
“I’d say thistles, but nobody listens to me, anyway.” - Eeyore