Not sure what you're asking. There's currently base health and base stam. Base health is going away. All health will be from stam Source
Not sure what was in the BlizzCon build. Important bit: Base health is gone. All HP = Stam. Source
No gear doesn't mean no Stamina. Characters have base Stamina. Source
Re: a question in that article... Yes, base damage/healing on spells is removed too. All from scaling. Equal scaling for all! Source
Nope, all secondaries besides Bonus Armor will be useful to healers. Source
Q: From what I gather tank will have a unique secondary (armor) and healers (spirit), do DPS get a unique secondary?
A: Current plan is no. Source
Yes. The stat squish will *not* make it harder/impossible to solo old bosses. No need to fear. Source