If I remember correctly, in X and Y's demo, you could choose which language the gameplay should be in. I think that leak might be fake because of what was said since all languages must be developed simultaneously.
That and there isn't much difference between European English and American English in video games outside of a few choice spelling differences.
Going to add something, I want to point out, ANY "leak" that says Oh I beta tested/I got my hands of the demo is 90% chance of being fake. Why? Gamefreak does
-not- outsource testers. All testing is done in house by Gamefreak employees and occasionally TPCi employees. Likewise Demos, pre official demo launch, are only available to TPCi and Gamefreak staff. They do not hand them out freely. If a rando from the internet got their hands on a demo, that means a staff member uploaded it or lost it and will more than likely lose their jobs because of this.
Anyone with a Demo, like the Tree House staff from E3, have their names recorded, are forced to sign non-disclosure agreements, and can be asked upon at any time to present their copies back to the developers. If there is anything funny about their copy, i.e. It has been tampered with to make copies or if anything seemed off about the copy they had, that person would serve jail time.
Anyone that says they are a beta tester ask them to post the serial code for the copy they have as well as a copy of their DMCA with their signature on it to verify that they are legit. That is the only way to see if a leak is 100% legit and that the tester is actually risking their jobs as well as lively hood to spoil game info. If they refuse or say that there aren't any, then they are most likely lying. Claiming second hand source, they can provide the exact same info as the direct leaker.
If there are leaks posted before hand and discovered in hindsight, then they also need a time stamp. This is the biggest thing against the Chinese Leak which some believe to be real and some believe to have been debunked with the newest trailer and newest surge of conflicting rumors. The Chinese leak had screen shots with no time stamps to show that they were posted before a specific date. This is something that is easily faked as a hindsight discovery.
The one successful leak we've had this go round was the reveal of Drampa, Topu Koko, Charjabug, Togedemaru, Bruxish, and company. This guy pulled the videos straight from the main website where he found them. No fancy, I worked for/got fired/beta tested/played the demo story.
Outside of this, there is a chance for another leak soon as the Volcanion and Magearna movie is about to air, and like last time, we could have new Pokemon appear like Squishy and Trevenant did. Let's hold 4chan leaks where they ought to be. 10-20% believability. Like what you like but do not assume that any of what is said is actually real. Some of them are very creative, others are knocked out of the park odd. Do not take any of them seriously or to heart. Look at them skeptically and just enjoy the ideas of what could be.
