Yes, her voice has definitely changed. She also seems to have some new answers. Ask her opinion about stuff and now, instead of doing a web search for non-Microsoft-related stuff, she'll say something witty
Yeah you're right! I asked her about Steve Jobs when I first updated my phone and got search results. Now she just says she hasn't had time to form an opinion yet. I'd much rather place holder replies than web searches for that. It makes her seem more intelligent when showing her to other people