The Humble Bundle site is currently running a NeoGeo 25th anniversary bundle covering several NeoGeo titles, and additional extras at high enough tiers. This covers the applicable titles already available on Steam, and several others as DRM-free downloads which can also be played on a browser. Notably, on of the available titles is Samurai Shodown V Special, which has never been ported outside the NeoGeo.
The tier breakdown is as follows.
Pay what you want:
Art of Fighting 2
Baseball Stars 2
Fatal Fury Special
King of the Monsters
Metal Slug 2
Samurai Shodown II
The King of Fighters 2000
Above average – all of the above plus:
Metal Slug (Steam available)
Metal Slug 3 (Steam available)
NeoGeo 25th Anniversary Soundtrack (Art of Fighting 2, Fatal Fury Special, Metal Slug 3, Samurai Shodown II)
Neo Turf Masters
The King of Fighters ’98 Ultimate Match Final Edition (Steam only)
The Last Blade
Twinkle Star Sprites
$10 or more – all of the above plus:
Garou: Mark of the Wolves
Metal Slug X (Steam available)
Samurai Shodown V Special
Shock Troopers: 2nd Squad
The King of Fighters 2002 Unlimited Match (Steam only)
$40 or more – all of the above plus a Metal Slug t-shirt.
According to the Trademark Bot, SNK Playmore has renewed the trademark for The Last Blade on 10/30/2015. The trademark is applicable to the categories of “computer software” and “additional online functionality.” Whether this means that a revival of the franchise is unclear at this point.