WF-1000XM4 or wait for WF-1000XM5?

so the new WH-1000XM5 has been released and I plan on purchasing a pair of earbuds instead of headphones. Should I get the WF-XM4 now or just wait? I am in no hurry but the XM5 aren't going to come out anytime soon then I'll just get the XM4 now.

Approx/guess when will the new earbuds version come out soon?