I had a problem with the EGR valve on my '01 Odyssey last fall (rough running, Check Engine light, TCS light). Took it to the dealer, who told me the valve was defective (not just clogged). They wanted to charge me about $250 to replace it, but I asked my service advisor (nicely) if there was something they could do about that price, given that this was a known issue with the valve. I was told that my van wasn't one of those included in the then-current TSB (based on VIN), but the dealership agreed to replace the valve for free as a goodwill gesture. This was before the warranty extension came out (I have since received notification of the extension in the mail).
I believed at the time, and still do, that this was one of those "secret warranty" deals under which a manufacturer fixes a problem at a consumer's request, without actually coming out and admitting any real responsibility. Whatever the case, it got fixed and didn't cost me.
If you're not having any problems, don't worry about it. But if and when you do, I would politely but firmly insist that Honda take care of it, and pursue it up the line if the dealer refuses.
Paul