The game is being created with the GameMaker developer package, using map data from the original as a 2D grid with 1d arrays.
There's no date for when the web browser-based game will be available for people to play, but when the public first gets to play it, it "probably" won't have maps or textures yet.
Dailly is posting pics of the game on his Twitter account as it gets worked on; you can find it here.