Of the many 'recent' enhancements, the ones I've been using include coherent averaging (within the distortion settings menu of RTA) to push the noise floor lower when identifying low levels of harmonics; better performance of the impedance measurement tool; and the 'add harmonic distortion' in the sinewave gen along with more dB resolution range for turning your soundcard and buffer amp into a distortionless (<-130dB HD's) generator tool.