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If you're wanting to do video editing, web design and software development on the move, I'd personally say that a 13" screen is too small. I'd go for the MacBook Pro 15".
However, you can connect a MacBook Pro to an external display when working at a desk which would allow you much more working space for your applications.
In terms of performance, I'd say that the machine should be able to cope pretty well with everything you want to do. I'd maybe look into the exact graphics requirements for the type of video you're editing just to make sure that the Intel HD graphics are up to it.
This machine's processor has an x86-64 instruction set - so yes, x86 compatible. It can run both 32 and 64 bit applications and Operating Systems.
There is an Android SDK available for Mac OS X as well as a whole host of IDEs. Macs can also run Windows if necessary, so I'm pretty confident that you'd be able to get all the tools you'd need.