It's going to loaded with 170 to 400 grain bullets. Kind of a one rifle for everything.
Doubtful it'll be very successful though.
Probably intended for European hunters to use both in their home countries and in Africa. Unlike us, Americans, Europeans are limited in the number of guns they can own and their ammunition supluy.
A one rifle battery to do it alll is probably an attractive proposition for Europeans, but for us, not so much. I do give RWS credit for a new heavy medium cartridge, as that class is the most interesting IMHO.