Hi Ann,
Well the good news is that it has proven to be hugely popular this year and as such will be on the 2015 programme of tours.
In terms of the dates, I've had a quick chat with my colleague who looks after this tour and he has mentioned that there will be a range of dates through the year including your desired May departure. And, for those customers who want a enjoy a bit of the carnival spirit there will be a special departure in February that includes the New Orleans Mardi Gras.
Kindest regards,
Juia