Mark Webber thinks there will be more! From a Sky News interview two days ago:
"It’s quite likely we will play in England before we disappear again. There's nothing confirmed yet, but we expect there'll be more concerts next year."
Looks like they'll be officially announced for Tramlines on Monday. Would be amazed if they don't do Glasto now. Would love to see them headline Pyramid, but if not, then hopefully headlining Other Stage rather than subbing on Pyramid earlier in the day.