2D is the most important, but 3D is VERY useful as well sometimes. I fear that, like Google Street View when it was new, coverage of that feature will be sparse at first, probably just certain most-populous areas. But hopefully it will expand in time.
Google Earth is often fun but actually useful, too—occasionally--for seeing a general lay of the land; lets me know what to expect when I set out on an unknown route away from the city. However, it’s a very vague kind of 3D when you get anywhere near the surface, with hills/valleys/bridges being very approximate, and buildings being simplified and stuck onto a ground surface that has distorted additional images of those same buildings.
Google Street View is VERY useful (and hopefully still present in Maps) for seeing tricky intersections/driveways in advance, looking for junction signs and business signs, and other small details you just can’t see from above. However, it has two problems: the obnoxious “jump 20 feet” thing instead of smoothly moving, and very low quality at times: so blurry and washed out that I can’s make out even big signs.
If by some miracle the new 3D view lets me get down to street level and see small landmarks better than Google, I’ll be very happy. Since the imagery comes from planes IIRC, I’m not holding my breath. Failing that, it still seems to show major landmarks, buildings, and the lay of the land much better than Google Earth. I’ll be glad to have it even if it’s not a daily life-changer.
(If they add turn-by-turn navigation, I will NOT be glad to have it
I’ve seen my Android friends get in a bind when they lose their cell signal and Internet connection. Driving instructions are too important to be reliant on the phone company’s signal! I’d be in the same boat if I used Waze or MapQuest on iOS. Instead I paid a measly ~$20 for Navigon MyRegion and have full navigation even with NO phone signal available. Which includes the most remote areas, where GPS navigation is vital. Full navigation apps are so cheap that having “navigation sometimes” for free is hardly an Android selling point. It’s yet another thing that sounds good in a bullet list and doesn’t mean much in practice: spend ~$20 and get something far better. There are many nice GPS apps on iPhone, with no ongoing subscription costs needed.)
The expectation is that the openstreet maps are a temporary fixture until Apple launch their mapping service.
I doubt the 2d version will look anything like what you currently see in iPhoto.
Right—what you currently see in iPhone is supposed to look like a “tourist map” with an old-timey look. Almost like a pirate map, even. It’s a map “theme” with a specific intent: to dress up your photos, just like there are themes in OS X mail which you can choose, and are not the “Apple style.” I’ve never cared one bit about Apple’s various iPhone/email/iDVD themes; I guess as a designer I don’t want anyone else contributing to the look of what I do, even if it’s a family slideshow! But I recognize that this all those iPhone maps are—a theme to dress up your photo presentations. Ideally they should have more than one theme... maybe they will. I’d like an “aerial” and a “minimalist” theme to choose from.