I have a Huawei E3131 3G modem and it doesn't work on latest 2012 MacBook Air. It works with older versions of OS X with USB 2.0 so it looks like the only problem is USB 3.0.
MacBook – Problem installing Huawei E3131 3G modem on 2012 MacBook Air
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Yes, the USB ports are powered. In fact, they are designed to power the USB SuperDrive, which draws more power than most USB ports support.
It's easy. The non-retina MacBook Pros didn't get a redesign on the outside. They stayed the same (so, no HDMI "and stuff"). They only got updated on the inside, so your confusion on differentiating them is reasonable.
From Apple's site - here are images of the new 15" non-retina MacBook Pro:
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Best Answer
My personal experience with Huawei is that their installation app doesn't even run on a recent Mac for some reason. When I used it, I used to look into the package content to find another installation app that would actually start. If that is not the problem, please put more details.
pmjordan might be right as well as far as 32/64 bit-ness of their installation app. USB2/3 should be backward/forward compatible as per their specs as far as I know.