Upgrade MXM or wait for new 1000 series cards?

Hi all,

got myself a laptop with a GTX970m and wondering whether it would be better to spend the money on a GTX980m or wait and see what they reveal for 1070/80 laptop cards and just get a new laptop?

I've got a Clevo p750zm with the aforementioned 970m I'm guessing even though it's MXM the 1070/80 new releases probably won't fit this chassis