That just recognises the fact they are continually working on optimisation… it doesn’t necessarily mean it’s in the current main branch and gives no timeline for release. One could expect to perhaps see the fruit of their recent labours in that regard by summer along with the DX12 roll out, but obviously they haven’t committed to anything.
As for the specific issues with the current patch, to my knowledge the only mention was in the associated Q&A a few days ago where they acknowledged they had already identified 2 issues and were considering whether to issue a hotfix or not.