First of all, we'd like to thank you for your support to Game First Internation. Regarding the issue mentioned in your letter, the following are informations for your questions.
(1) Can we update (English Interface + English Sounds) to (Chinese Interface + English Sounds) in the future ?
Answer: based on the current design, no they will not be able to
(2) Can we log in Asia server ? or just U.S server ?
Answer: The Americas, Europe, and Asia will be accessible for TW players
(3) Can we free change servers that we wanna log in ?
Answer: Yes you are able to play, and freely change to play either in The Americas, Europe, or Asia.
If you have additional questions, we are welcome to contact Customer Support again, thank you!