Hi!
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MonoGame releases are made from time to time but you can access github for latest development version (which usually has daily updates) at https://github.com/mono/MonoGame , or just get the development build on the downloads section which are also updated often.
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Personally I use Visual Studio 2012 for windows/winRT/WinPhone and Xamarin Studio for iOS/TVOS, but I suppose any editor can be used if you set it up correctly.
There’s a giant UI lib thread here: UI Frameworks -
Yes, monogame is just a library made with C#, and C# supports that.
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No idea about WiiU, I think it hasn’t been developed yet. However Apple TV support appeared a few weeks after its release. It usually depends on how hard supporting that platform is and, as it’s a community project, how many people work together in order to get that platform working.
p.s. Are you the HexDump from PsPectrum ? 