I am obviously late, but there is a possibility that we will be getting synchro tuners in the mini box Chronicles of Glory, if Stardust CHRONICLE Spark Dragon is the UR. It probably won't happen, but that is the only UR worthy Chronicle or Glory card I can think of.
Other than spell chronicle and glory of the noble knights, SCSD is the only card of either category in Yugioh, as far as I know. Synchro Tuners incoming.
That being said, there was also another leak, supposedly a datamined information, which states the name of the next box, and it wasn't even close to "Chronicles of Glory", so we don't know yet what is actually the next box.
For me, I'd believe Konami's site more than a leak, so the next box is likely called "Chronicles of Glory".
SCSD is not confirmed, and neither is accel synchro. Sure, we are getting T.G.s, but accel synchros haven’t been confirmed yet. I still think that SCSD is likely, but just speculation.
Well, looking at the phrase "I'll show you a strategy that you've never seen before", I'm guessing Bruno will have Blade Blaster in his deck. NPC only.