Yes I'm having the same issue since the latest iOS update. My wifi reception has dropped substantially - 2 or even 1 "bars" in places in the home where it was full reception. It drops out repeatedly, stopping podcast downloads.
I have both a router and a range extender and the problem exists with both of them. It also exists if I try to connect to public wifi - completely unusable...
But also, I use bluetooth headphone a lot, and the reception for them has plummeted to the point where continually drop out even when the phone is in my shirt pocket - i.e. just 30cm from the headphones. Before the update, the reception was halfway through the house!.
I know it wasn't the headphones causing this because I thought so and took them back for exchange under warranty, and the new ones are exactly the same.
So both wireless reception and bluetooth transmission strength have gone down the toilet following this iOS update.
Is Apple doing anything about this? It seems the communities are full of similar complaints...