It was released on console first then about a month later...PC
When they create a patch for pc it will take longer than the consoles because PC's are more complex than consoles.
On top of that there are alot more issues to address on PC than the consoles.
My guess is that UBI want to release a permanent fix patch...it's every game developers way they want to release a patch that reduces the likelihood of another patch being needed.
We thought it was 1.4 but now they are working hard on 1.5 and we should just wait and see.