Comment #25 on issue 2225 by asmeurer: Enhancing Matrix Norm http://code.google.com/p/sympy/issues/detail?id=2225
I think Norm(matrix) is suggested to be an object, which is unevaluated by default.
Usually stuff evaluates by default, if it can. If it can't do it, or if you explicitly call a lazy version, it returns that. For example, integrate() does it if it can, otherwise it returns an Integral, which you can also call explicitly (and it will remain unevaluated, even if it can do it).
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