Let's say that I have Stonebrow, Krosan Hero, Ferocity of the Wilds, and a non-Human creature that doesn't normally have trample on the battlefield. If I attack with the non-Human creature does it get the +2/+2 bonus from Stonebrow?
Stonebrow's triggered ability will trigger. In this scenario, as soon as a non-Human creature you control attacks, it will immediately "get +1/+0 and have trample" thanks to Ferocity of the Wilds (C.R. 613.1f-g, 613.3b, 613.4, 611.3b, 113.6), so that Stonebrow's triggered ability will trigger for that creature since it's now a "creature you control with trample" (C.R. 508.1k, 508.1m; see also C.R. 603.10, 603.2). See also this thread.
Let's say that I have Stonebrow, Krosan Hero, Ferocity of the Wilds, and a non-Human creature that doesn't normally have trample on the battlefield. If I attack with the non-Human creature does it get the +2/+2 bonus from Stonebrow?
Yes. Here are the relevant rules:
508.1. First, the active player declares attackers. This turn-based action doesn’t use the stack. To declare attackers, the active player follows the steps below, in order. If at any point during the declaration of attackers, the active player is unable to comply with any of the steps listed below, the declaration is illegal; the game returns to the moment before the declaration (see rule 722, “Handling Illegal Actions”).
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508.1k Each chosen creature still controlled by the active player becomes an attacking creature. It remains an attacking creature until it’s removed from combat or the combat phase ends, whichever comes first. See rule 506.4.
508.1m Any abilities that trigger on attackers being declared trigger.
508.2. Second, the active player gets priority. (See rule 117, “Timing and Priority.”)
508.2a Abilities that trigger on a creature attacking trigger only at the point the creature is declared as an attacker. They will not trigger if a creature attacks and then that creature’s characteristics change to match the ability’s trigger condition.
Example: A permanent has the ability “Whenever a green creature attacks, destroy that creature at end of combat.” If a blue creature attacks and is later turned green, the ability will not trigger.
508.2b Any abilities that triggered on attackers being declared or that triggered during the process described in rules 508.1 are put onto the stack before the active player gets priority; the order in which they triggered doesn’t matter. (See rule 603, “Handling Triggered Abilities.”)
611.3. A continuous effect may be generated by the static ability of an object.
611.3a A continuous effect generated by a static ability isn’t “locked in”; it applies at any given moment to whatever its text indicates.
611.3b The effect applies at all times that the permanent generating it is on the battlefield or the object generating it is in the appropriate zone.
Example: A permanent with the static ability “All white creatures get +1/+1” generates an effect that continuously gives +1/+1 to each white creature on the battlefield. If a creature becomes white, it gets this bonus; a creature that stops being white loses it.
If we call the attacking creature a Runeclaw Bear for the sake of definiteness, at the point where the ability would trigger, that is a 3/2 creature with trample.
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Why bother with mere rulings when so many answers can be found in the Rules?
Rule 508.1m actually is redundant, since it states something which is already imbedded in triggered abilities. Triggered abilities always look at the gamestate AFTER things have happened**. Stonebrow's ability, for example, will look at the gamestate right after you attacked, and thus see trampling attackers:
603.10. Normally, objects that exist immediately after an event are checked to see if the event matched any trigger conditions (…)
Yes. Here are the relevant rules:
If we call the attacking creature a Runeclaw Bear for the sake of definiteness, at the point where the ability would trigger, that is a 3/2 creature with trample.
**Barring a few exceptions, irrelevant here
RULES OF MAGIC :
http://magic.wizards.com/en/game-info/gameplay/rules-and-formats/rules