What are the Specific effects of the Updated Monster Spawning Rule?

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According to the Minecraft release log for update TU19 (Xbox 360), under Tweaks: Gameplay, it states:
"The longer you remain in an area, the harder the monsters that spawn in that area will be"
I have several questions about this:
- What is defined as "remaining in the area"? How big is the area?
- How far (and for how long) outside the area does one need to go to reset this difficulty? Or does it remain the same, even after an extended absence?
- What does "harder monsters" mean? A higher number of monsters? More monsters that are difficult (What is the scale of difficult monsters)? Does that include monsters from other worlds (nether, the end)?
- Is there some way that this could be leveraged to get better drops/more XP?
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