The question was:

Will holding the Alt button show unit/building hit points overhead as they did in Warcraft 3?

There was no answer...

Is this answer a "Yes"?

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Q u o t e:
The question was:

Will holding the Alt button show unit/building hit points overhead as they did in Warcraft 3?

There was no answer...

Is this answer a "Yes"?

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Yes. And you can change the option on the menu for this.
Normal: Only show when holding Alt
Selected: Selected units only
Always: Show all unit status bars