The following is from the Y-Full Experimental Tree for J-L210, December 2015.  Additional information for 6 of our members who have tested positive for the Y15222 SNP which occurred around 1150 C.E. has been added.  

J-L210   FGC3307/Z452 * CTS2194 * FGC3291/Z447... 77 SNPs formed 12500 ybp, TMRCA 4800 ybp
This SNP is NOT included in the J2 SNP Pack.  
     J-L210* id:NA20521 TSI
     J-Z489 FGC3361/Z489 formed 4800 ybp, TMRCA 4700 ybp
          J-Z489*
               id:YF01661 UNK
          J-Z482  Z27996/Y9001 * Z482 * Z7628... 10 SNPs  formed 4700 ybp, TMRCA 4500 ybp
               J-Z482*
               J-Z478 CTS11011 * Z478 * Z487... 21 SNPs
                    id:NA20801 Tuscany, Italy (TSI)
                    id:NA20787 Tuscany, Italy (TSI) 
               J-Y15222 Y15246 * Y15235 * Y15234... 24 SNPs formed 4500 ybp, TMRCA 950 ybp
                    J-Y15222*
                         id:YF03901 KELMER
                         id:YF03667 SCHWEITZER
                         id:YF04730 England (REESE/LEVI?)
                         REPOGLE
                         STROUSE
                    J-Y15238 Y15238 * Y15241 * Y16261 formed 950 ybp, TMRCA 700 ybp
                         J-Y15238*
                              id:YF03372 DEU [DE-BY] ROTHSCHILD
                         J-Y16180 Y16180 formed 700 ybp, TMRCA 600 ybp
                              id:YF03771                     SOSLAND/KANTROWITZ
                              id:YF03731BLR [BY-MI]   KING/GUNZBURG
                              id:YF02520 POL [PL-LD]  LEFKOWITZ

ybp= years before present 
SNPs in BLUE are available at Family Tree DNA.  If you are a member of this project, do not purchase any of these SNPs.  SNPs in RED  are NOT available at FTDNA, but can be ordered through Y-Seq.  Presently the J-L210 is downstream of the e J2 SNP Pack.  

Our members; ROTHSCHILD, SOSLAND, KING & LEFKOWITZ have all done Big Y,  and all have had their results analyzed by the private company "YFull".  As you can see, they are all positive for a SNP called J-Y15238.  This SNP is dated at around 1300 C.E.   As the GÜNZBURG line has a MRCA (Most Recent Common Ancestor) who was born around this time, it is very possible that this SNP could have occurred by a KNOWN ancestor.  If so, then this GÜNZBURG ancestor may be the common ancestor for everyone who has the J-Y15238 mutation.  

What this means for you is that if you test some of the newly discovered private SNPs, you also may be able to connect to an ancestor born many generations earlier than your oldest known common ancestor.  Please contact our administrators before purchasing SNPs from either FTDNA or YSeq for help in determining the best SNPs to order.   Each of the men who have done Big Y have additional private SNPs that you may wish to test.