Perhaps the key word in Dave's reply is "currently". It could be under discussion but not yet decided. But I doubt we'll know until they are ready to announce it, which will probably be suddenly if they do it like they did with the T6's.
There were several sales on T5's of 5%, but it was just after the big sale of 20% that they introduced the T6 (if my memory serves me correctly). We've had a 5% sale on the Fornax but none on the Cents, so I wouldn't be surprised if the introduction of new tanks were later rather than sooner. Personally, I think we will see a new map or two before we see new tanks.
Dave is in no position to reveal that sort of news even if it were true.
About 2yrs maybe, i remembered Dave wrote in responsed to a thread "he is not a programmer so he can't tell anything about game changes unless his got an information to make announcement" its not exactly as accurate as Dave said but..... before all T6 came out Dave did made a thread on all their specs...
all these T6 concepts are a prototypes of existing tanks out here. Who knows whats next... I've seen a video of a new redesigned M1 abrams i wont be surprised if Iron Force will also redesign its Corvus... "just à wishful thinking" don't take It seriously tho... cheers! 🍻