This new 10 fils coin has a steel core (thus magnetic), while the previous type (KM28) was made of brass.
3rd october 2012: Gijs Vlothuizen confirms that 5 fils 2011 is also magnetic (possibly steel core).
We still need data about the rest of the denominations from 2011/2012...
(information by Gijs Vlothuizen)
(image by Ovidijus Giniotas)