there is one coming out. Sababa toys will be introducing it later in the year. Saw it the other day at Toyfair. Your pretty closeo nyour guesestoo. The pieces are as follows.....
Pawns: Lamppost with Little Bird
Castles: Count and OScar
Horses: Grover/ Prarie Dawn
Bishops: Ernie/ Bert
Queen: Cookie Monster
King: Big Bird
Hope this helps.
--matt