If you could confirm about support for these items on the GrovePi:
Grove Servos - to get servos working with the Raspi, we need the Pivot Pi. The GrovePi on its own is not enough. Also it is possible to mount the PivotPi on top of the GrovePi
Grove Circular LED - has a library been made to support this component on the GrovePi?
Grove Speech Recognizer - has a library been made to support this component on the GrovePi?
Grove Speaker - I understand the Grove Speaker is not supported, correct? And that we should use the aux output on the Raspi to get audio out.