One think that I found interesting was the increased language support for Siri, specifically the addition of Korean and Cantonese since I travel to Asia occasionally.  I find it very challenging to learn either language, even though I picked up German and Spanish fairly easily, so the thought of Siri being able to recognize the very different subtleties of Korean/Cantonese is pretty impressive to me.  Takes me back to my undergraduate days as an Anthropology major studying linguistics - like they say, you can take the boy out of Anthropology, but you can't take the Anthropology out of the boy.  

Hardware wise, I'm with jimlynch, the Retina Macbook Pro has me counting the change in my car's ashtray.  Looks like I need a bigger ashtray!  It is a premium product at a premium price, but I want one.  Now!  The iPads with the retina display look fantastic; I would love for the display I use to do actual work to look that great.  Maybe Santa will be good to me this year.