Please post back with an update in a couple days. I've been having Safari keyboard lockups since September and I just jailbroke a few days ago. I don't want to give up my jailbreak if I'm not sure 8.1.1 fixes the Safari bug. Thanks.
As of now, I have yet to have a Nother keyboard freeze. Even after typing several post on the site with my iPhone six I have not had a lock up. I assume, and I hope, that it's fixed for good.