Board Thread:Spoilers!/@comment-413929-20141211181204/@comment-24936039-20150311010452

The Hong Kong dragon was just slightly more important then say Nurse Severe, so maybe doesn't require any billing in the credits then any other extra having (if any) one-two lines - so there is a chance that we'll see a tiny glimpse... (Doesn't preclude having him around for a more extensive part in a later episode\season).

An aside: People are wondering who the father is of Maleficent is. Since Maleficent is a dragon, and assuming that dragons don't repro asexually (see http://www.scientificamerican.com/article/asexual-lizards/), then maybe the Hong Kong Dragon was/is her mate/true love. And due to the Charming's meddling (villainous acts before the first curese), not only did Maleficent lose her baby (Lilly?), she was ripped from her mate/true love (who like Ursella and Cruella) ended up in the LWM (Hong Kong) while Maleficent became imprisoned under the clock tower in Storybrooke, likely retaining her memories, but stuck in dragon form.