One ogre can hit (and thus 'pose some level of threat,' albeit not much) to a 1st, 5th, and 10th level character in D&D Next.
One orc warrior can hit (and thus 'pose some level of threat,' albeit not much, to) a 1st, 5th, and 10th-level character in D&D 3.5.
Isn't bounded accuracy supposed to accomplish something? Isn't the point to make monsters more broadly relevent? I mean, there's nothing stopping you from having a couple dozen orc warriors or even basic ogres show up against your 10th-level 3.5 party, but I don't think anyone would call them particularly relevent to the outcome on average.
Oh, sure, maybe once in a awhile the orc scores a x3 crit with his greataxe, but by and large? They just die in droves without accomplishing anything.
The goal for D&D Next is not that you
can throw those lower-level monsters into a combat - there hasn't ever been anything in D&D, any edition, that stopped you from doing this; rather, the goal is is that, in D&D Next, you can throw those lower-level monsters into a combat
and the players will have to react to them like they were a threat, because they are.
I don't see a +4 attack bonus ogre, regardless of his damage code, being particularly relevant to a 10th-level party's average defenses (because, as demonstrated, he's not particularly relevant to a single-character's 5th-level defenses).
EDIT:
To be clear, it's entirely possible that the ogre is a bad example, because the designers, while implementing their bounded accuracy "template," have decided that 10th-level is beyond the envelope of usefulness for a level 3 Elite monster, and that's fine. We just don't know, yet.