Hey Marie,
I read similar but earlier articles when Infiniti and Mercedes were announcing their tech-sharing partnership. Infiniti are looking to expand their engine line-up and develop engines for the Euro market, as Infiniti is trying to make it big in Europe since it has already established the market in the US. Also, I think Mercedes are looking to get knowledge on shared platform technology (e.g. FM platform = Z, V/G & Stagea, etc), as it does reduce development cost. So its a good thing overall, I'm just not sure how things are gonna work since Infiniti has a partnership with Red Bull Racing F1, which is akin to the Renault-Nissan alliance and Mercedes is another competitor.
Good to see the ladies reading tech stuff, keep it up!