Oxegen?

Martin's tweet this morning:

Goodbye Dublin. It's been a very enjoyable/boozy weekend. Thanks to everyone who came to the shows, see you again in the summer.

Implying that Mogwai are playing either Oxegen or Electric Picnic? As the former tends to share much of its line-up with T In The Park, and Mogwai are already confirmed to play T In The Park, Oxegen seems the more likely option.