Nothing has really changed for Samsung, LG, Sony, or other Android phone manufacturers.
Motorola WAS a direct competitor and Motorola will remain a competitor. The main difference is that Motorola will be a more benign competitor since Google will want to maintain a good working relationship with all of its partners.
The acquisition of the patent portfolio will probably take all of the teeth out of Apple's patent litigation.
If you look at it from one perspective, Google made a wiser choice than Apple. Apple went in with a consortium of companies and paid $4 billion for a group of patents that won't really help them improve their product.
Google paid 3 times that for a company that manufactures phones (and tablets?)
Apparently, this has been in the works for a very, very, long time. This is probably the entire reason that Motorola spun off Motorola Mobility from the parent company.
I have a friend who works for Motorola Mobility... ate lunch with him 2 weeks ago and he didn't breathe a word of this to me even though we talked about phones and google