I doubt a new bundle will come out.
NA have 3 possible Pokemon XL that we have not seen and non of them have been leaked by anyone, news/store SKU etc.
for X/Y there was the Gold X/Y LL that was pokemon center only in Japan. Japan got the Blue X/Y LL (no red). NA got the Blue and Red X/Y XL so that may just cancel out any need to bring gold here.
Then there are Eevee and Charizard but there has been no mention of it anywhere unlike the Pikachu and it also doesn't make sense to bundle X/Y game with these XL when the actualy X/Y XL is not bundled.
Plus, 2DS is released the same day and that would make more sense to bundle it as being more children/budget friendly but there is not a single mention of it also. Maybe stores will run their own bundle, but I don't follow store specific threads.
The gamestop tracker for my LA has 8 GS within 5 miles of my location and all show the Red X/Y XL in stock with only 1 being low stock. I would probably not wait till the same day the game is release to pick them up but considering the process to have new LE/bundle/etc shipped and tagged and advertised, it would be unlikely to have all of this go unnoticed so close to game release.