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Something they've announced they plan to add or just... not going to happen?

Probably not going to happen.

Apple seems to value more about apps, content and siri, and futher improve what most use it for, and neglecting the small part of Home sharing & iTunes others use it as well.

Home sharing was never searchable ever even with any Apple TV, so Siri defiantly won't be on that list.
 
It seems that the demise of Front Row on the Mac is an indicator of Apple's strategy with ATV. They don't want to make it easy to play iTunes video content from a Mac on an ATV.

At least ATV now has its own app store so the opportunity is there for someone to develop a much better app than Computers for browsing and searching iTunes content. Hopefully DRM videos are not blocked from 3rd party ATV apps.
 
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