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Just caught this a bit late and probably to late to add something but my two pence is test it in Webmaster Tools, via Crawl -> Robot.txt tester - if you've not used this before simply add the url you want to test and Google highlights the directive that allows or disallows it.

I was meaning bold.

I can go one further just so we can all reminisce, here's Google just over 10 years ago... http://imgur.com/ARW9BGS,GXdbYe7 and here's Google today ... http://imgur.com/ARW9BGS,GXdbYe7#1

Settings the same, tried incognito and searching as per usual via Chrome, just tried IE (can't believe I've had to use IE - oh well!) and the same,  across two different IP addresses within our office too, no difference.  We are UK based, there may be something in that  - tried on Google.com though and no bold keywords!

Hey Bryan thanks for the response,  to me the titles aren't highlighted on your screenshot - maybe your screenshot is a bit to unclear either that or I need glasses?  If so not actually a major change - just looks weird after having seen that emphasis for 10 years?

Anyone else seeing this?  Or is it a test rather than full rollout?