Blame it on Orbi. SEGA is in the proccess of changing & transistioning its brand name to SEGA Orbi. Due to that, SEGASammy's R&D operations have been suspended.
This could also be factoring in the suspension of the KP trademark & is probably why the final round of optical form 3rd party titles have been delayed until,further notice.
So with that being said, I think the RINGWAVE's frequent delays indicates that they definetley have some sort of surprises & might have BIG plans for its hardware.
SEGA hasn't displayed any NEW Arcade IPs since last year. I notice that lately the only thing they keep showing is upgraded RINGEDGE rereleses and I notice something funny, they keep displaying VF5 Final Showdown as if teasing tthe existance of Virtua Fighter 6 like their not ready to show it yet.
ArcadeHeroes & TheStringerReport have reported time & time again since last fall that SEGA plans on debuting VF 6 on NEW arcade hardware. This confirms that the new board does exist.
So when the HELL will SEGA finally annouce the new machine? I'd say in May, when SEGA Orbi begins to assemble as a brand & when SEGA Orbi unveils all of its business plans.