Poor baby! This yorkie is probably not going to have long hair. Coat looks too wirey around the legs and sparse everywhere else, even with the green glow - coat hairs on leg is very thick, short, and wirey - JMO I am sure though he is very sweet.
Here are some good photos on the YTCA site - see 11 weeks old photo and you can see the difference.
http://www.ytca.org/pictures.html
T.