Here's the description from Glen:

"WSM ADL trigger guard (ballpark price TBD)
This was built to eliminate the feeding problems associated with most WSM builds. The trigger guard replaces your BDL system with minimal inletting required. The mag box is built in and the feed lips are not only adjustable, but also replaceable. This is perfect for shooters not wanting a DBM and no worries about dumping your rounds on the ground in the field. Also, 3.15� OAL!!
This will also be offered for standard calibers later in the year.


Details/pics:

http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=878167&page=1