Here's hoping the YF-21 will come with landing gear and attachable guns, though the chances are slim. Really annoyed by this "DLC" type add-on model.
EDIT: The sound booster will be released late July and costs 2,940 Yen (inclusive of tax).
The landing pad plus accessories will be released late August and costs 2,100 Yen (inclusive of tax). " Includes shoulder block, closed fist, joint part for Gunpod, landing gear and display stand."
(According to the Tamashii website via Ngeekhiong)