Thanks everyone !
So if i understand correctly i need to change the pins location on my pack connector, using the "old" KO Propo housing (see http://www.kopropo.com/faq.htm
It would mean that KO did change the connector on the receiver to the standard one, but not on the TX.
I'm going to try it asap.
Edit : Wahooo it works!
BTW can is use the same wall charger i had for my old hitec system ?
I believe that only JR use the reverse type. Can someone confirm?