While doing a review of the LEGO DC Comics Super Heroes The Batman: Tumbler (30300) polybag, Jason from The Brick Show revealed there will be a Ultimate Collectors’ Series Tumbler coming in 2014. There’s no sources connected to this rumor so we’ll have to see if it is true. There have been a couple of versions of it already in official sets including The Tumbler: Joker’s Ice Cream Surprise (7888), The Bat vs. Bane: Tumbler Chase (76001), and The Batmobile Ultimate Collectors’ Edition (7784) which was an alternate model. The Tumbler was also submitted to LEGO CUUSOO by Brent Waller but was ultimately rejected.
Again, the UCS Tumbler is just purely a rumor as of this time since there are no actual sources for it. Check out their review below and around 2:22 is where Jason confidently states there will be one coming out this year.