While I believe there are future firmware updates for the 6248 in the works. I am not aware of any additions to the MIB/OID library on the switch. However, when the firmware comes out I would suggest checking it out just to be sure. Thanks 
Anyone know if there are plans to expand the OIDs supported for the 6xxx series? Specifically I am interested in  ipNetToPhysicalTable - 1.3.6.1.2.1.4.35 Thanks, Scott
PowerConnect 6248 snmp support