Last night I decided I wasn't going to do anything to acknowledge it. This is her decision to end the M and there's no point in me giving her a card or anything on a date she likely sees as meaningless.
Let me just warn you, I thought the exact same thing at Christmas. Then I found out in the 11th hour that W had bought me presents and it left me scrambling to get something for her at the last minute, LOL! If your W DOES do something for you, then just ask yourself if you're OK with not doing anything for her in return, which if you're not that is perfectly fine. But if it would make you feel bad, then you might at least prepare something just in case she initiates.
I honestly don't understand why my W continues to buy stuff for me, she gave me gifts and took me out to dinner on my bday a couple of weeks ago and then got me more gifts and dinner again on father's day. This after she told me a month ago or so that she was ready to file for D. So I'm just going with the flow, I have ZERO expectations that it means anything, I just enjoy it for what it is. My W is still a wonderful, thoughtful and kind person and I see this as the reason she's still honoring my special days, not because she's ready to reconcile.
