USDM Acura:
Legend -> RL -> RLX
Integra -> RSX
Vigor -> TL -> TLX ('14)
SLX -> MDX
RDX
TSX
ILX
ZDX ∅
NSX -> _ _ _
Going by current & ongoing Acura nomenclature, an "X" at the end seems to be the trend. And back then, there was the concept HPX (Honda Pininfarina Experimental) & later the NSX (New Sports Experimental).
No idea what Honda/Acura have planned. An NSX-E or NSX-Hybrid are as plausible as NLX, NEX, NHX, etc. The NSZ seems quite possible (CRZ being "Compact Renaissance Zero"), as aforementioned; it just doesn't phonetically flow. Mashup into SZX (Sports Zero Experimental? Super Zero Experimental?) makes sense, albeit a bit clinical.
I guess, it's currently known as NSX-Concept. NSX-E is somewhat appealing, could be for Electric -or- Evolution -or- Earth -or- Energy or along those lines. I hope it doesn't go the way of serializing such as NSX-II (similar to mark two), second-series, type-2, NSX-redeaux, etc!
For all we know, the "N" might not even be there (as "New" isn't that relevant now, regarding sportscar but it may hold for technology). So...
ASX... Advanced Sports Experimental? (seems like a real contender to me! could also be Alternative Sports Experimental)
ZSX... Zero Sports Experimental?
GSX... Green Sports Experimental? (*cough* Suzuki *cough*)
ESX... Electric (or Extreme) Sports Experimental?
WSX... World Sports Experimental?
FSX... Future Sports Experimental?
NSX... Next Sports Experimental?
New NSX... it works for Apple!
Or may be, just may be...
HSX... Hybrid Sports Experimental?
Need to remember the Honda/Acura interest in the letter "H" in the past decade w/ their NSX/halo-sportscar concepts: HSC (Honda Sports Concept), HSV-10, etc. Likewise their interest in the letter "A" w/ the Acura Advanced Sports Car (AASC) & Acura Advanced Sedan (AAS).
May be a worthwhile exercise to see what Honda/Acura has trademarked!
... and I am still holding out for the scissor style swan-doors ala HSC! Please, please, and please... I would unequivocally buy the NSX-Concept then!
(not to mention that novelty alone would be big, big deal in the market segment)