Hopefully, NOT. I see no reason for them to increase the already high price. Just because they provide slimmer bezels and USB-C? iPad Air had slimmer bezels and was less heavy than the previous iPads but was introduced at no extra price.
The iPhone saw a price increase with the X models because they have OLED displays - and the 6.1” is exactly as expensive as the last year’s 5.8” 8+.
But If you’re right then there will be a HUGE gap in the prices of a regular iPad 6 and a 11” pro - $/€ 500 to be exact. What features will they offer to warrant that? See no reason to pay that much. My Air2/64GB will be good enough for a few more years.