I believe the announcement simply means that since FF3 just came out in final, it might be a while before those "issues" get addressed. As for being coded with "IE in mind over other browsers" from what I've heard from a lot of developers, they spend more time fixing issues to work in IE since it seems to render things according to its own "standards." I've had to do that very thing on my own blog: if browser is IE, use this class, if anything else, use this one. Annoying.
I've seen sites that refuse to support IE. Maybe it would get them to use a real standard, not their funky made up one.
All the spewing of this browser being faster than that browser is just mainly exaggeration of fanboys.
Not always. FF3 takes 1-2 seconds to start-up, vs. 6-7 for IE7. Logging in to Hotmail, takes about 2 seconds for FF3, 6-7 again for IE7. For me, at least. It's not much, but it adds up.
Extensions really are FF's biggest asset. I listed my favorites on the last page. Yes, I am a fanboy.