1. There have, but it's just not feasible, since Zanz will have to code the two versions in separately, which means that all new cards/features/bug fixes will come at less than half the speed they're coming in now.
2. No, but your sample size is too small to reach a definite conclusion. Once you pool a large enough number of data points together (think in the thousands), you'll see that Nymphs are a roughly 1/30 chance from the Oracle.