From the webpage I linked above:
We will be studying “Sahidic” Coptic: the Upper Egyptian “literary” dialect of Coptic, in which the classic Coptic literature is written, as well as the Gospel of Thomas and the rest of the Nag Hammadi library.
We will be using Introduction to Sahidic Coptic by Thomas O. Lambdin, as our textbook and you will need to purchase a copy in order to participate.
I know so far Ser and I are signed up. Anyone else? Class starts on 4 May and homework will be due every other Sunday starting 17 May. Directions to sign up at the website I linked above.
Edit: fixed link and date