Key features of the New 3DS over the older models:
- "Superstable 3D" -- uses facial recognition technology with the inside facing camera and an infrared light to track the position of your face and adjust the 3D image to match. This works very well in my experience and is really the biggest selling point IMO. It makes the 3D much easier to use.
- Improved hardware specs -- doubled up from a dual core ARM CPU to a quad core chip, also doubled the RAM from 128 MB to 256 MB. The graphics chip is apparently the same though, and reports vary if the CPU and graphics chip received an upclock. The improved specs won't improve framerates in regular 3DS games, though they can improve loading times. Only "New 3DS exclusive" games make full use of the new specs, and there's only one such game -- Xenoblade Chronicles 3D. The better specs do make the operating system feel smoother though, with faster download times and a more responsive and useful internet browser that can play 3D Youtube videos.
- Super Nintendo Virtual Console games are only playable on the New 3DS, not the older models. That means games like Super Mario World, Super Metroid, Legend of Zelda: A Link to the Past, etc. Nintendo uses emulators to run "Virtual Console" games on their newer systems, so presumably the older 3DS model couldn't emulate the Super Nintendo smoothly while the New 3DS can.
- The C-Stick -- a touch sensitive nub that works as a second analog input. It's not a full thumb stick or circle pad since it doesn't move, more like the mouse inputs you can find in the center of the keyboards on some laptops. It's quite responsive though. It's specifically supported by some newer games like Super Smash Bros, Majora's Mask, and Monster Hunter 4, and it's backwards compatible with games that supported the Circle Pad Pro addon, like Resident Evil Revelations and Metal Gear Solid Snake Eater. There's also two additional shoulder buttons.
- Better, somewhat louder speakers than the old XL model.
- Uses Micro SD cards for storage instead of standard SD cards. It does include a 4 GB card already installed, which is plenty if you're just going to run games off the cartridges. If you plan on downloading games from the EShop, you may want to get a 16 or 32 GB card. Also, if you replaced the SD card in your current 3DS with one larger than 4 GB, you'll need a micro SD in the New 3DS that's just as big so the transfer process can work.
As for the transfer process, the first thing you should do obviously should be to look at Nintendo's official setup and walkthrough of the process:
http://en-americas-support.nintendo.com/app/answers/detail/a_id/13996/~/what-you-need-to-know-before-performing-a-new-nintendo-3ds-or-new-nintendo-3ds
http://en-americas-support.nintendo.com/app/answers/detail/a_id/14169/p/430/session/L2F2LzEvdGltZS8xNDYyMDkxODc3L3NpZC8xdWpxMW9QbQ%3D%3D
You'll need to go into each system's settings, sync them up over a Wi-fi connection, and let them transfer some crucial data from the old system to the new one. That could take about 10 or 15 minutes. Then, you turn of the systems, take the SD and Micro SD cards out of each. Connect the old system's SD card to a PC with an SD card reader, and copy all the data from it. Connect the new system's Micro SD card to the PC with either a USB-Micro SD adapter or a SD-Micro SD adapter, and paste all the data from the old SD card to the Micro SD card. Put the Micro SD card back in the new system, and it should be good to go, no further setup needed. Wipe the data from the old system's SD card, put it back in, and the old system is effectively restored to factory settings -- the next time you turn it on, it will act like it's being turned on for the first time.
Yeah, it's a little convoluted. The alternative is just transferring
all the data from the old system to the new one via Wi-fi, which could take
hours, especially if you have downloaded games on the old system. You're working with Wireless-G grade adapters in each system. Not recommended. And yes, Impulse is right, the New 3DS does not include a charger cord. You'll either have to keep the one you have now or buy a new one.