I'm not commenting on the likelihood of this, but they HAVE done a simultaneous localization before, so it is possible. True, it was for the 10 year anniversary in North America, but this year is the 15th!
The next major Tales title for Japan will be next year probably.
Very doubtful. They hardly ever pass up Sep-Dec without releasing a new Tales in Japan. Not since 2003, in fact.
2012: Xillia 2
2011: Xillia
2010: Graces f
2009: Vesperia PS3 and Graces Wii
2008: Hearts
2007: Innocence
2006: Destiny Remake
2005: Abyss
2004: Rebirth
The reason I MIGHT see Japan not getting another mothership this year is because there has been that merger/absorption of Tales Studio that might complicate things logistically. But I doubt that will change much.
Note that Hearts R and Innocence R were outsourced to 7th Chord. I fully believe Japan will have another Tales this year.