Chris was recently quoted as saying it wasn't out of the question for the band to be touring before the end of the year. While it is not out of the question, a full-scale tour this year appears unlikely at this stage.
The good news is that Daniel's condition has improved enough in recent weeks, to allow him to travel to the US to seek further treatment. We don't know whether this is a general improvement or just a "better phase" for Daniel as the disease is by nature unpredictable - it can be so bad he can't move around on one day, and then be very much improved the next day. The doctors are still confident that this will pass and Daniel will make a full recovery in due course.