If I am remembering correctly the last 2 or 3 refillable mug designs have each been used for around 2 years. The current design was introduced in January or February of 2011. Hopefully that means a new design this year!!! I don't even know how many of the current one we have. I will be there in 4 weeks and have my fingers crossed for new mugs. Anyone there recently, or going in the next few weeks, wanna keep an eye out for new mugs?