The Dragon expansion will be published in the third quarter of 2011. I think it will be nescessary to change or adapt The Dragonland expansion.

So, let's wait ...

Considering yours is a corner board, likely they could co-exist happily. Of course its not the first time an expansion has come out that emulates what's been done in the fan community in one or more components. Don't be in a hurry to change anything.