Dari Cult of Mac (emphasis added):

Split-screen multitasking on the iPad begins to make much more sense when Apple starts making bigger and bigger screen sizes. A 13-inch iPad that can run apps side by side? There could be some real appeal there, especially for the enterprise, where the idea of traditional, desktop multitasking still reigns supreme.

But in the state we’re in now, multitasking on the iPad is the way it should be: one app at a time.