If anything, the Metroid Prime 4 update proves that sometimes no news is very good news. Nintendo just went with the Python-esque "all of the people making this game have been sacked, we will now redo everything in a completely different style." SNK probably doesn't have the war chest to get away with that, so they need to take their time and get everything right the first time.
MP4 devs messing up is no surprise, especially considering Nintendo is a bad joke of a company and every 1st party videogame is mediocre and overrated. and when a disaster like MP4 comes up, the fanatics are there to apply damage control to the situation.
SNK is not Nintendo nor those incompetent devs, and they sure aren't making a bounty hunter simulator. they are masters of fighting games.
also take note there has been NO footage of MP4 gameplay, whereas SS at least got a teaser gameplay trailer already revealed and its now 90% complete.
so this is not expecting SNK to promote SS consistently before they are ready, but rather spectulation and a bit anxious to when they are gonna start the promotional campaign like they did with KOFXIV and SNK Heroines. and with heavy hitters along the way through Q2, it brings to question how they are gonna make Samurai Shodown 2019 enticing enough to the mainstream, so it at least does better than KOFXIV.
remember Blizzard took a loooot of time developing Diablo 3, at it was still initially a critical disaster until a major reform much later.
and there are other examples like Duke Nukem Forever, FFVersusXIII, and others that took absurd amounts of times to 'get right', and they still turned out bad.
so extra time and secrecy =/= better preparation nor better quality product.
MP4 devs are downright incompetent so they really can be compared to SNK.