The Gambo Store Blog has posted a question & answer entry, providing more details on the Japanese Transformers credit cards announced earlier.
Q. I'll apply to Autobots card, but I want to Decepticon Micron and Quo card.
A. Sorry, we can't provide any goodies of opposite faction to you. but you can purchase Exclusive Strafe whichever you are on.
Q. is Strafe's number limited?
A. No. it's production-on-order.
Q. When can we see colored Strafe figure?
A. No idea right now.
Q. Any plans of another card member exclusive figures in the future?
A. Yes. we'll notice members thru Basecamp when it comes.
(note that Ganbo Store and TF Card are operated by same company, so it's kinda official Q&A.)