The ZG, has finally been revealed on the Koto blog. The HMM Gojulas has seen progressive previews during the past few months, with a complete model being placed on display at Wonder Fest.
http://hmmzoids.jugem.jp/?eid=160
http://hmmzoids.jugem.jp/?eid=161
update: a third blog post has been put up, showing he planned release date and price of the upcoming Zoid. The Gojulas is set to be released in December 2013, for a price of 24150 yen.