You will add tablets also in the future?

Yes, though other things are a priority (check out my other comment)

I'm using firefox because of the same reason, google chrome is using a lot of memory on mac...

A lot of people say that megaupload is back, but if I'm not wrong this is totally something different then megaupload or do I make a mistake?

You can't share a link with the public anymore, only with an emailadres.

Gizmodo says you can share them with a link

http://gizmodo.com/5977265/how-megas-encryption-will-protect...

which makes it no different to before, except this time they're hoping deniability is better than openly facilating piracy in their internal communications.