https://wccftech.com/two-new-metal-slug-games-set-to-launch-later-this-year/

According to Korean webzine Inven and Gatoray on Twitter, SNK Interactive will have not one but two new Metal Slug games in development that both appear to be ready for a 2020 launch. Not counting the recent remakes of Metal Slug 7 that released on Xbox One and PlayStation 4 in recent years, these would be the first new successors to the franchise in over a decade.

The Metal Slug series received its last official version in Metal Slug 7 on the Nintendo DS. Since then, SNK Interactive has released a number of compilations and enhanced versions but nothing in the genre of run 'n gun in quite a long time. Even the last newer titles to bear the name were tower defense titles called Metal Slug Defense and Metal Slug Attack.