Not yet, v6.9 should be very similar to 6.8, my tests show very small differences (checks with single parity are a little slower faster, with dual parity a little faster slower) but those are very small differences +/- 5MB/s to 10MB/s and likely just because it's using a different kernel, but basically it will be the same, I would guess that understandably LT is looking at more important issues first, but do hope this will be eventually fixed.
Edit: slower/faster corrected, it's the other way around