Is Omeka meant to have a one-handed grip or not? For consistency if it doesn't it should surely be 10 deadliness and list no changes in the grip (and if it does it should obviously be listed).

Yes, I think a part is missing to be consistent with the Katana entry. Grip should be:

1 Hand: -

2 Handed: +2 Deadliness

What is an omeka? I can't find the term in the rules nor updates?

Edit: Never mind, it's in the kakita blade preview.

Omeka was the Kakita Blade held by Doji Kuwanan ..... as currently stated it's a unique weapon. Guess it should be added stats for more "standard" Kakita blades