Kufu - 4:18 pm on Sep 8, 2010 (gmt 0)
I saw the streaming results last night from my home computer; however, this morning at the office there is no sign.
Based on what I saw, the new feature could help the sites ranking in top 10 for the main category keyword, because as you type the first word in a search phrase (e.g. widget--the first word in the search phrase 'widget blue') the streaming results are automatically for 'widget blue'. So some may just find that search good enough for what they are looking for and stop typing.
Based on that this might be somewhat harmful for long-tail keyword rankings.
P.S. I'm in Los Angeles