Ethan Hawke has confirmed a couple of stories doing the rounds lately while speaking to Indiewire.
Yes, he spent a small portion of time filming a scene for the big budgeted Total Recall remake, but said that his scene will most likely be cut from the finished movie, instead possibly ending up as a viral video. Also, and more excitingly, he said there would indeed be a reteaming with writer/director Richard Linklater for a third film in the Before Sunrise/Before Sunset series, "We’re also doing a follow-up to BEFORE SUNRISE and BEFORE SUNSET, so that will be fun. We’re going to shoot that this summer."
The first two are really lovely films, and if you haven’t seen them they're worth a gander.