No
The new iPad has the highest resolution of any tablet
The iPad retina means that the given iPad has a high pixel density and resolution.
The iPad 1 and iPad 2 both had a resolution of 1024x768, for a total of 786432 pixels.
the new ipad
No, it is not possible to upgrade the memory, resolution, video or network features on any iPad.
It's not very likely that we'll see a 3D display on the next iPad. But rumours are pointing at the next iPad having a new display with a higher resolution than todays iPad 1 and 2. The resolution will match the quality of the iPhone 4's retina display.
The iPad has been replaced by the iPad 2, which has been replaced with the 'new iPad'. Refurbished iPad 2s are available in the Apple Refurbished Department. You can donate your iPad to Teach For America at any Apple Retail Store. You can also get tablet computers which are like the ipad (for example, there's an apple iphone, but you can also get an android which does something like the iphone).
Graphics speed and resolution, and the camera.
No. You can download any iPhone app from the app store and run it. If it is not made for the iPad, you can view it at the 1x resolution, which runs in a screen the size of the iphone, or you can blow it up to 2x, that covers most of the iPad screen. You won't be able to take advantage of the iPad's enhanced resolution, and it will look a bit blocky, but it will work.
If you are considering purchasing an iPad and want to know how much more expensive iPad 2s are compared to the first generations, the answer would be a little more expensive.
Yes, but only on extended resolution mode.