Or so it would appear based on this (in French, Google translation here); it's a foot injury that might keep him out of French nationals as well. According to the report, it's similar to what happened in 2007 (spiking the blade into his foot). Back then, he won Worlds a few weeks later... hopefully he'll have good results this season, too. Get well soon, Brian!
Tomas Verner was the first alternate, IIRC.
ETA: moderators - the "apparently" should be taken out of the thread title as it's been confirmed by the FFSG.