Finally. After the initial public release of Yosemite over a month ago on October 16th, 2014 Apple have released the first minor incremental update to address some issues that have plagued the OS since its release.
Although the latest update 10.10.1 specifically addresses fixes for wifi issues, tonnes of people on Twitter and the Internet as a whole are complaining it did not fix the issue for them.
Personally for me, the issues have been fixed, but understandably everyone is using a different Mac. I am using a late 2014 MacBook Pro with Retina Display and the wifi issues appear to have been fixed for me, my Internet is noticeably faster and more secure (so far anyway).
The other issue is Apple waiting almost a month to release a minor update that only addresses a few of the issues people are having (albeit not very well) when they should have released one in the first two weeks of its release. Perhaps testing was a factor, but either way, it should have been released soon.