Mae Mesur y Gymraeg (Cymru) 2011, sy’n sefydlu’r Panel Cynghori, yn nodi bod yn rhaid i Weinidogion Cymru sicrhau, i’r graddau bo hynny yn ymarferol, bod o leiaf tri ond dim mwy na phum aelod ar y panel ar unrhyw adeg. Bydd Rona, Elin a Gwyn yn ymuno â’r aelodau presennol sef Anne Davies a Nia Elias ar y panel.
The Welsh Language (Wales) Measure 2011, which established the Advisory Panel specifies that the Welsh Minister must ensure that, as far as it practicable, there are at least three, but no more than five, members of the advisory panel at any time.  Rona, Elin and Gwyn will join the existing Members, Anne Davies and Nia Elias on the panel.