This time it's almost certainly true. R3 was known to fail EURO4 for awhile, it's too loud, EURO4 isn't just emissions but engine and exhaust noise also.
If you want to buy new, don't wait, do it now!
Triumph do have a new bike in the works but please learn from Triumphs history. The cancel a bike, tease the next one to garner interest and release nothing for years and years. They've done it with almost every model now at some point.
The Daytona 955 is the perfect example. They've built not one, but three working prototype refreshes of a big bore Daytona since 2006 thatve been seen in pictures and still no new big Daytona.