This trademark probably won't apply to anything. Pokemon WaterBlue and Pokemon Grey were/are both trademarks owned by GameFreak as a precaution in case they might possibly use them in the future, and some people say to stop others stealing some of their profit with a cheap knockoff game under one of those two names. GameFreak also trademarked Pokemon Delta Emerald before the release of ORAS, but no one really thinks that's going to happen, nor did they think there would be a version named Delta Emerald at the time. I think that naming the next game Pokemon XY&Z would be beyond stupid and I heavily doubt it will be named that. It's just so clunky.