Just because Blizzard have announced a feature as account-wide doesn't mean that should or does include F2P accounts, it's rather stupid to apply your self to that generalization. I'm not saying F2Ps won't get access to this. I'm saying you shouldn't think you know 100% that they are. Features that Blizzard announce are for paying customers, whether F2P get them or not either depends on them not caring enough to bother doing anything, or them just fucking up. They have done things against F2P (not generally but specifically those who use their accounts to play on like a normal account) in the past. And what makes you assume my responses are "snotty"?
This is the last time I'm responding to you. If I wanted to spend my time explaining my every sentence, I'd talk to 5-year-old.
I am close to certain that heirlooms will be Battle.net-account wide because it has been stated by Blizzard that they will work similarly to the Mount and Pet-tab. And you can see in the picture above that all those tabs, including the Toy Box, are in the same window.
There are lots of facts pointing towards heirlooms being Battle.net-account wide and there is nothing suggesting the opposite.
You say Blizzard might not let us share heirlooms with our F2P-accounts to screw with us, but that is not a well thought out idea. Letting us share heirlooms with our F2P accounts is something that would make sense for Blizzard to do. Letting F2Ps get heirlooms would split the F2P-community and cause for more imbalance in the bracket, Blizzard earns money from the players renewing their accounts or buying P2P-accounts to get heirlooms for their F2Ps, and the people getting their heirlooms might check out the P2P-content and notice that it's pretty cool, deciding not to go back to being a F2P. All these possibilities benefit Blizzard, and the only thing benefiting the F2P (not the community, just the single player) is that he can now gain a small edge over other F2Ps (not good because it's splitting the community and causing imbalance).
Also, don't talk about me being 100% sure about anything, we're talking about the next WoW-expansion here. Nothing is ever a 100% sure to happen, but what I'm talking about is a fact-based assumption, and my facts are pretty damn good.
And I didn't assume your last response to be snotty, I perceived it as such. Look the words up in a dictionary.