2. We'll have Chrome/Firefox extensions for something similar to "signed binaries"
3. We offer the option to run the web client yourself (git clone https://github.com/lavab/web && cd web && npm install && gulp && open "http://localhost:5000")
4. We'll build native desktop and mobile clients.
Hope this answers your question.
I don't really understand this fascination with hosting things outside of the US "for security" (from apparently, mostly US citizens). Personally I'm in Norway, where the secret police have been spying on "dissidents" (it used to be the "far" left, nominally the neo-nazis/fascists (although they missed the only terror attack, despite having a tip before the fact) -- now it's the "radical" Muslims (you know, a clearly defined threat to national security, aka "brown scary people")).
But regardless of how one feels about using Stasi methods to help perpetuate and sustain illegal wars on the middle east -- one thing should be abundantly clear: Nowhere (AFAIK) does foreign citizens have any rights to not be spied on by local intelligence services. And of course all of NATO is working together on gathering it (along with Sweden, which Norwegian intelligence reportedly work closely with).
All that said, while I think we should all work at taking back our respective governments, and strive for a better (more free) political environment -- I don't think the only measure for an email service should be "am I now safe from state-sponsored actors". In fact, I think that should actually be pretty low on the list.
Use gpg, or give up. More significantly, if you can't do the work for a proper web-of-trust/key distribution and verification, you can't be secure (in the sense indicated above).
I still think services like these are miles better than you-are-the-product, like gmail/outlook.com etc.
Good luck on your service!
The "NSA can spy on you argument" doesn't really apply here. You just try to provide solid security against that. Having poor security in "America" wouldn't save you from NSA anyway.
I also don't think Germany will be a safe haven for someone working against the drone program if that involves leaking classified information (otherwise known as espionage, even if it stems from altruistic motives).
I feel people are as much in denial about the likelihood of spying by European governments, as many were about the NSA (and for no better reason -- the NSA was documented to break the law long before Snowden, and so have various European governments).
I don't really see this as much of a win either way. But perhaps it's good marketing copy.
How do you prevent the scenario of being forced to provide a poisoned client-side encryption payload, just like e.g. Hushmail was?