I seriously doubt we'll be seeing a filler set this time. For English, they've always adjusted things to have the first set of a new series come out closer to the games, but only after the games had already been released. If there's no BW10, then that works out perfectly anyway because they can just move on to XY1 in November, one month after the games. It's actually the existence of BW10 (if it will exist) that will throw everything off pretty badly.
They moved up Neo 1 to have it out closer to the release of GS here which created a six month gap until Neo Discovery. Power Keepers and Call of Legends were thrown out so that the games would come out first, and then DP1/BW1 would follow immediately as their first new sets; they even pushed up BW1 so that it was out only a month after the games. The only real time they strayed was with RS due to the switch from WOTC to Nintendo, and even then Nintendo took the license back early just to get RS out faster, killing off several planned WOTC sets.
You forgot to note that none of our sets are released before the Japanese counterpart. How can there be a XY1 set, if XY1 set wasn't even released in Japan? If we don't get a BW10, we might get a filler set, until Japan releases their XY1 set. That's what I am getting at.
If anything, the Japanese XY1 set will be released in december. We will never release our XY1 set any day before the middle of December. We might release our set a week after, but if we have a BW10, we might have to move Megalo cannon a month early, and release BW10 in October, and then release XY2 in april. If not, they I guess it could work, but we might have to do a filler set afterwards, as I don't think there is going to be a Japanese XY2 within 5 to 7 months.
As I said before, we are not going to get the XY 1 set in november. It is highly impossible, because Japan didn't release theirs yet, and it isn't a filler set, like EX power keepers. So, I came up with the tin idea to allow people to buy part of the set, and get the full set in 2014. That's really the only way to do it.
Now a question to you, if Japan releases XY1 in January 2014, which is 3 months ahead of October, just like how BW set was released 3 months after BW game, and let's say BW10 doesn't exist, then what happens in the months of October, November, and December? Filler set maybe? The fact of the matter is, we will never get a set before Japan. It never happens. EX power keepers was a filler set so we can release 4 sets a year. Japan doesn't have a 4 sets per year rule. They got power keepers after, in a limited run, for tournament purposes only, just to be fair in the world championships, so other than that, we never get a set before japan. If Japan releases theirs in January, then it is 100% likely we are going to get a filler set if BW10 doesn't exist.
Come to think of it, I am 100% positive that BW10 will exist, which means we won't need a filler set. Here is what the releases going to be.
BW10 released in October 2013.
XY1 released in January 2014.
XY2, a filler set most likely, released in May 2014.
That's how it is going to be. If you don't believe me, then name one Japanese TCG set that introduced a brand new generation, released exactly less than a month and a half after the games? Also name one International TCG set released before the Japanese counterpart, where the Japanese counterpart has to be an actual set, not some set to make things fair for world championships? Basically saying, we are the only ones who care about releasing the set closer to the release of the games, but it doesn't mean anything if Japan doesn't have theirs yet.
If BW10 doesn't exist, how about XY filler set, similar to EX power keepers. Brand new TCG exclusive cards, if we are intent on releasing an entire set close to the game's release. The fact of the matter is, Japan doesn't do that.
Perhaps a mini set, packaged like Dragon's Vault, with a set of 25 TCG exclusive or preview XY cards, released along the final BW set, either BW10, or a filler. I'm sure nobody wants shiny collection right? If they do, they could just release them along with the XY mini set. You don't need an entire set released close to the games themselves. A few cards can suffice.
There are many ways to fit the TCG set releases, BW10 existing or not. The fact is, our XY1 will never be released before the Japanese counterpart, and they most likey won't release theirs in October or November.