There is no weightmapping for any of the Gen 3 models, I'm afraid, and only V4.2 has been weightmapped so far.  Although, there is a beta WM M4 long forgotten ATM. 

It would seem that Gen 3's have been neglected lately, not too many new items in the offering to keep them interesting any more.  However, users do go back to them on occassions. 

My advice, jump into the Gen 4's and any available 3rd party models especially if you hope to upgrade to PP2012.