Here are a few random data points for you, but I'll admit since I bought my R is October I havent been as close to the market as I was:
- Prices on the R are coming down. I'm seeing used Rs with asking prices in the high 60's and rumors of a few new Rs going for MSRP (previously $5k ADM was about the best you could find)
- The performance gap between the base GT350 and R seems to be closing with the 2019s
- According to the posts on FB from Billy Johnson, there seems to be pretty significant gains in the suspension and ABS tuning for 2019. I assume that includes the R
I'd be surprised to see a DCT or a 2020 model, but I havent been following it too closely.