Here's the link to the list of phones and tablets known to be getting Jelly Bean (Android 4.1)
http://www.droidforums.net/forum/dr...et-list-known-getting-updates-jelly-bean.html, and as you can see on that list, the RAZR/MAXX are getting Jelly Bean. Whether that list will be updated to include the D4 or not remains to be seen, but you can be sure the list will grow. I think the D4 has a good shot, since it is getting ICS according to Motorola's site. Also, it's not technically part of "the Razr Series", it did come out DURING the Razr Series releases (if you are speaking purely Razr and Razr MAXX), and technically it's virtually a clone of the Droid RAZR, with a keyboard and supporting hardware and code included.
The following is from Phone Arena:
"Taking into account that one handset (Droid RAZR MAXX) is priced higher than the other (Droid 4), one would assume that the processor hardware in one is going to be better than the other. However, that’s not the case as these two devices are powered by the same 1.2GHz dual-core TI OMAP 4430 processor. To sum it up, both perform equally to one another, as they’re capable of maintaining a consistent rate of responsiveness with almost all operations – albeit, they’re plagued by that darn choppy pinch zooming in the gallery.
In terms of memory capacity out of the box, the DROID RAZR MAXX has the upper hand, seeing that it has a 16GB microSD card, 8GB of internal storage, and 2.51GB reserved for apps. Conversely, the DROID 4 is outfitted with 8GB of storage with 2.36GB for apps – though, it can be supplemented further with a microSD card of some size."
This information above lends additional credibility that the D4 might make the list for Jelly Bean, but there's no guarantees.
This article claims the D4 has the best qwerty keyboard available, and I tend to agree
Motorola Droid 4 still has the best QWERTY keyboard in town | Mobile Bloom News.
Considering the D4 was released 2/10/12 AFTER the Droid RAZR (11/11/11), and considering that makes it a newer phone by 3 months against the Droid RAZR, I could see it getting Jelly Bean. Edit: The only thing I wonder, is whether having the code for the keyboard could actually make it somehow incompatible with the Jelly Bean OS.