Ong-Bak 2 has been released on DVD in Thailand, according to Bangkok1080, which has a review. It looks fantastic.
Also, a Blu-ray release is planned in Germany, according to Logboy.
The German DVDs usually don't have Englisch.
And unless you've been living under a rock (or meditating in a cave perhaps?), you'll know that Thai DVDs almost never have English subs, and that is definitely the case with this one.
A Hong Kong release is forthcoming. Let's see what happens with that.