The graphic will  probably  be 2D that look like The New Samurai Shodown (2019)  or Street Fighter V esque art style. 

Why would they? If you've been following SNK even just a little, they have completely moved away from 2D graphics. The last 2D KoF was expensive and time consuming and they said "nope, not doing that again" 

Metal Slug 8?

Cool, looking forward to it. Also cool to see Neo Geo sell better than expected.

Because why not? Todays trend are nostalgia, classic and retro style games . Games Like the New Megaman are great and many 2d platformer games selling good on the market especially from indies titles like Shantae.

Just make the games mechanic original but with improvement and upgrade the graphic using 3d background with artistic style, will sell the games like crazy. I see the same pattern with 2d fighting games like Street Fighter, Guilty Gear Xrd and Samurai Shodown. Also 3d polygon actually cheaper rather than creating 2d sprite on HD system.  Guilty Gear Xrd, Street Fighter and Samurai Shodown are using Unreal 4. It's faster, cheaper and can be used on many platform. 

Was talking about 2D graphics, not gameplay. I misunderstood first though.

Would still be sad, the little sprite animations of Metal Slug were always top notch (and hilarious AF), it would be sad if they were gone.

On another note, SNK Heroines apparently sold through 300k according to the article, not bad.

I hope the Ptolemaic Army makes a return and we get to play as Trevor and Nadia again.