It is not so sure. I do not know about the curves, but gradients work, but in the v1.1 way.
For example
Code:
<svg width="100" height="100" viewBox="0 0 100 100">
<radialGradient id="BallShader" gradientUnits="userSpaceOnUse" cx="30" cy="30" r="80" fx="30" fy="30">
<stop offset="0%" stop-color="white" />
<stop offset="60%" stop-color="green" />
<stop offset="100%" stop-color="black" />
</radialGradient>
<circle fill="url(#BallShader)" cx="50" cy="50" r="50" />
</svg>
uses radial gradient - the "toughest" one -, and it works at least on 3250, N80, N91, N93, and the emulator.