I just stopped by the 3rd and Pike Starbucks in downtown Seattle, and they are indeed doing the free-coffee-in-your-reusable-cup offer. It's not advertised and they're not making a big deal out of it in-store, but if you ask, they'll give it to you. No purchase is required, although I felt a little obligated to buy a tiny sparkly sugar donut for 75 cents.
On the way, I peeked into the downtown post office, where about 25 people were standing grimly in line waiting for the gate to go up. I guess they're all waiting to get their tax returns off today. I will spare them (and you) the wagging finger, but that's that much less time that they could be off getting free coffee, cupcakes, ice cream, tacos, food, and MOAR today.