I just got mail from one of my hosts where they noticing me about new serious flaw in Wordpress and they recommending immediate upgrade since I have many WP sites. I think this dont look as usual practice.

Is it possible that they are really worry about my sites and my well being .

Also they are very friendly and with good reactions, for me noticing they for
some vulnerabilities when I found them around like last one mentioned by Will.
Example: http://www.netbuilders.org/managing/...-now-5629.html
Or with some boring questions.

Does your host do things like this for you?

I am not mentioning the host since I don't want to be responsible if someone register there and after a year some problems popups